watch it
Step 1: Prep the ScreenMix the photo emulsion as per the directions.
Coat the screen with photo emulsion, working fairly quickly over a sink or surface you can get messy.
It's OK to have indoor lights on during this process, but keep out of direct sunlight. The emulsion needs to be applied evenly, so keep flipping the screen over and squeegeeing until the emulsion is even on both sides. Any globs will cause uneven exposing and will mess up your end result. The thicker the emulsion is applied, the longer the screen will have
to be exposed.
The screen needs to be completely dry in order to expose it, and should be dried in a pitch-black room. I dry my screen by resting the wood frame on a couple of shoe boxes in the closet, so that the screen is parallel to and above the floor. This allows the air to flow above and below the screen to help it dry faster. Make sure that only the frame touches the boxes, so as not to mess up the nicely applied emulsion. You can place a fan (I use Vornado because they are compact) next to the screen. Drying it this way takes 30 minutes to an hour, depending on humidity.
Step 2: Expose the Screen
Now that it is dry, place the screen on your workspace with the bottom facing down. Put your transparency on the screen in the center and as squarely as you can, then place a piece of glass on top. This holds your transparency down so that it makes direct and even contact with the screen. If it doesn't make direct contact, then your design will appear fuzzy around the edges.
The light source needs to be placed about 12 inches from the screen to get good results, and it needs to shine evenly across your design. I use two $10 task lights. These are great because they allow me to easily adjust my light source, and by having two, one on either side of the screen, we can make sure the entire design gets an even, direct supply of light. Follow the directions that came with the emulsion for exposing your screen. It varies with the bulb and screen size. I'll burn our screen for about 30 minutes. You can tell when the screen is done by looking: the exposed areas turn dark green when they are baked solid by the light.
Tip: For a super-dense positive, make two transparencies with your design on them. Line them up and attach them together with double-sided tape.
Step 3: Wash and Dry Screen
Now that the screen is exposed, wash it off in the sink with hot water. It takes some force to wash the screen effectively. I've attached a special nozzle to my faucet that creates higher pressure. (I got a nozzle at Bed Bath & Beyond for $5. Just screw it on and it'll toggle between high and low. Works great for dishes too; I leave it on all the time.)
Along with spraying, you can gently rub the screen with your fingers. Don't use your fingernails. If you force the emulsion off, you run the risk of tearing
off the hardened emulsion, putting you back to
step 1. You want only the unexposed area to wash off. Under hot water, the emulsion will become slightly gummy. Drying the screen isn't such a big deal this time around, now that it isn't sensitive to light. Prop it up against the fan, or place it where it can get some air. Silk dries quickly.
Step 4: Print It
Now that the screen is exposed, washed, and dried, print it and see how it works. Try it out on paper first.
Lay the screen down flat, making sure that your surface is even and flat.
With a spoon, put a glob of paint on the screen and spread it the width of your design. Don't get any on the design itself, just the area above it.
Now the fun part. Hold the screen down firmly
with one hand (or have a buddy help hold it). Use a squeegee to pull the ink down to the bottom of the screen. Apply a small amount of pressure to the squeegee as you pull the ink. You will be able to see
the paint evenly distributed across the screen.
Lift the screen and look at your beautiful print! Be very careful when you lift off the screen. Try to peel it slowly and directly up, so you don't smudge the fresh ink. It may want to stick to the paper.
It's as easy as that! Lay the screen down on another piece of paper and do a few more prints for fun.
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2. Preparing Your Artwork
What you need:
~ Original artwork with a high contrast~ Transparency film
Screen printing is a very “flat” medium, so images that are starkly contrasted work best. When preparing your artwork to be burned to the screen (to create the stencil), work in black and white only — grey tones and the subtleties of photographic images will not produce a workable stencil. If you start with a photo, as in the example below, reduce the information to a line drawing, or apply a filter or halftone screen in Photoshop which will reduce the image to a series of dots.
I used the photo on the left as a source to produce the drawing on the right, but I liked the red colour of the boxing gloves and wanted to include that in the final print. You can print in any colour you want, but the artwork used to make the stencil must be black. I coloured in the glove shapes, making sure they remained registered correctly to the drawing:
Every colour you want to print requires a separate stencil.
Once you have the artwork prepared, print or photocopy it onto transparent film, and you will be ready to produce the screen stencil. It is very important that the black areas printed on the transparency are completely opaque, so hold it up to the light and make sure all the black lines are totally dense.
3. Burning the Stencil
What you need:
~ The screen~ Emulsion and sensitiser~ A scoop coater or squeegee~ Rubber gloves~ A rubber spatula~ A darkroom and photosafe light~ Black bristol board, or black cloth or felt~ Transparencies containing your artwork~ A sheet of glass~ A light fixture with a 250 watt photo flood bulb~ A timer~ A spray bottle full of cold water~ A shower head, spray nozzle or garden hose
This is the most intensive step in the screenprinting process, but if you take a little extra care when making the stencil, the printing process will go super fast.
The first thing to do, after your screen is degreased and completely dry, is to coat the screen in emulsion. Emulsion is the photosensitive goop that will make the stencil on the screen. In areas where the emulsion hardens, the screen is blocked so no ink can pass through. In areas where the emulsion is kept soft and eventually washed out of the screen, the ink will pass through to produce your print. Emulsion is hardened by exposure to light, so you need to conduct this entire process in a darkroom using photosafe lights to see by. I use the extremely ghetto mechanism of a Blessed Virgin Mary (BVM) night light with a red christmas tree bulb inside (witness the shame below) and coat my screens in our windowless bathroom (it gets worse).
Leave the coated screen in the dark to dry for at least 2 hours. Some tutorials say one hour, but I always have bad results with that timeline because the emulsion is not ready. The important thing is that the emulsion is completely dry before you expose your image. No stickiness allowed.
Once the coated screen is dry, you can expose it. It is easy to set up a home exposure unit by arranging materials in this order (from bottom to top)– 1. black cloth or board on the bottom to absorb the light and prevent it from bouncing back through your image area; 2. screen next with paper side down (against the black board); 3. transparencies against the squeegee side of the screen, oriented so that you can read them normally from left to right; 4. a sheet of heavy glass on top of the transparencies to hold them down as tightly as possible to the screen surface; 5. a lamp situated about 1 or 1.5 feet above the glass top with a 250 watt photo flood bulb installed (any good photo store has these for about 8 bucks a bulb).
Don’t forget to set up this exposure unit inside the darkroom! Also, make sure there are no obvious dust particles or other matter in between the transparency and the screen or the glass and the transparency. Any material that blocks the light from getting to the emulsion will show up in your stencil and will interrupt your print.
The other big thing to keep in mind here is that the outer two inches of the screen area (closest to the frame on all sides) are unprintable. Because the tension is so high where the fabric is stretched around the frame, you can’t get a good print out of the border areas of the screen. Make sure your image does not go closer to the frame than 2 inches all around.
Once you have the unit set up in the dark, turn on the flood light for about 15 minutes and allow the emulsion to harden in areas that receive the light.
At the end of 15 minutes, you can turn off the flood light and work in the regular light of the room (no more darkroom necessary). Remove the glass and transparency (you will probably be able to see a ghost image of your design at this point, but if you don’t — it’s okay) and immediately, thoroughly spray the entire surface of the screen with cold water. You have to do this right away and wash the screen out before the emulsion gets hard where your design is. Use a spray nozzle in your shower (how convenient that my exposure unit is in the bathroom) or sink, or use the garden hose to spray down the the screen. Gently pass the spray across the whole surface of the screen until your design is completely washed out. Hold it up to the light to make sure no cloudy areas remain inside your stencil. If any pinholes show where you don’t want them, paint them in with left over emulsion and leave them to dry in the sunlight. Now your stencil is done! Let the screen completely dry before printing.
4. Printing the Image
What you need:
~ One set of two hinge clamps
~ A large flat surface~ A big sheet of acetate (at least 2 feet square)~ The finished stencil on the screen~ Packing tape~ A rubber spatula~ Appropriate ink for your printing surface~ The right squeegee for your printing surface~ Whatever you plan to print on (t-shirts or paper)~ A hot iron
To set up for printing, you need a completely flat table or counter top with two hinge clamps installed at the far side and a large piece of acetate or velum (at least 2 feet long — much larger than the paper or fabric you are printing onto). Tape the acetate down firmly at one end so that it will not budge. You need it to be perfectly fixed at one end in order to properly register your print.
Fasten the screen into the hinge clamps with the squeegee side facing up and make sure you can move the screen into an upright position in the clamps without it falling back down to the printing surface.
Use packing tape to block off any open areas of the screen that you don’t want to print.
Prop the screen up slightly with your roll of tape and apply a line of ink onto the surface of the screen about 2 inches above the image to be printed. Flood the image with ink using your squeegee. Make sure you have the right kind of squeegee for the material (paper or fabric) on which you are printing. If printing on fabric, make sure you use fabric ink, otherwise your image will wash off in the laundry.
Make sure the acetate is between the printing table and the screen. Lower the screen to the table surface and print the first copy of the image onto the acetate. Immediately flood the image with ink to keep it from drying out. Raise the screen to an upright position in the hinges.
Use the acetate to register your image in the right spot on your shirt or paper by orienting your shirt or paper underneath the acetate.
Remove the acetate (just move it out of the way, don’t detach it from the table!) and lower the screen onto your shirt or paper. Print the image by holding the squeegee at about 45 degrees and applying even, strong pressure to pass the ink through the screen.
Remember that this ink dries to plastic. Any area, however small, where it dries in the screen will become unusable in the future. In between each print, flood your image. When you’re done printing, wash the screen of all ink right away. Mr. Clean (or any non-gender specific water based cleaning agent) can be used to wash out ink (if necessary) without degrading the emulsion.
Screen ink dries very quickly, so if you are printing in many layers on paper, you can print the second layer on top of the first within about 20 minutes (I wait longer just to make sure no colours bleed together, but you can do it in 20 no problem). If you are printing on fabric, let the image dry for at least an hour (I wait 2) and then iron over top of the image on the hottest setting for at least 1 full minute. Ironing the ink makes it colour fast in the wash.
Easy huh?
Here’s what the printed shirt looks like, and here’s what the same image looks like, in two layers, on paper:
Step B-Selecting inks for printing on paper
Art prints require porous-surface papers of high quality. For most other printing applications, construction paper, drawing paper, charcoal paper, pastel paper, most board items (except railroad board) and cover stock (especially good for greeting cards) will be fine. Ink remains water soluble after drying.
Avoid slick coated, high gloss papers or vinyl or plastic coated papers.
Stir the ink completely until you achieve a "buttery" or "creamy" consistency. If too thick, add one or two drops of water or Water Soluble Transparent Extender Base. Mix thoroughly. Colors may be intermixed.
PERMANENT ACRYLIC INKSFine art prints require smooth matte finish, medium or heavyweight papers. To overcome "buckling" caused by water penetration, after each color run is dry, place a flat weight on stacked prints. This will cause them to dry flat and is especially important for good color registration.
These water-based acrylic inks dry waterproof.
To achieve transparency or economy, SPEEDBALL Extender Base (preferred) or Transparent Base may be added. Do not allow ink to dry in screen.
For most other printing applications like posters, greeting cards, book covers, etc. 20# weight and over cover stock paper is recommended.
Avoid slick coated, high gloss papers or vinyl or plastic coated papers.
Stir the ink completely until you achieve a "buttery" or "creamy" consistency. If too heavy or thick, add one or two drops of water, SPEEDBALL Acrylic Extender Base or SPEEDBALL Acrylic Transparent Base. Mix thoroughly
Step B-Alternative
Selecting inks for printing on non-paper surfaces.
WATER SOLUBLE INKS - These can be used on wood or masonite if first coated with an acrylic emulsion base coat such as SPEEDBALL Gesso. To achieve waterresistance, use an acrylic aerosol spray or a solventbased varnish as a topcoat.
TEXTILE INKS -These can be used on almost any fabric that can be subjected to a hot iron (275'-375'). Do not use on nonporous fabrics such as nylon.
ACRYLIC INKS -These inks can also be used on wood, masonite and many coated surfaces. Always pre-test before using.
Step C-Printing on paper
Spoon out the ink across the end of the screen nearest to you. With the screen lifted slightly from the base, apply an even blanket of ink onto the print area. Be sure to use an easy, smooth stroke with the squeegee at a slight angle away from you. This is the flood stroke. Drop the screen onto your paper Lift the squeegee over the ridge of ink and make the print stroke by pulling towards yourself. Keep the squeegee at a 45 degree angle with enough pressure to scrape the ink from the screen. Lift the screen from the print, make the flood stroke, set the kick leg, remove the print and put it to dry on your rack or line. Insert new paper, release the kick leg and repeat the process.
Sharp clear prints can be produced provided you (1) maintain a generous quantity of ink on the screen, (2) use the flood stroke and (3) maintain adequate and even pressure on the squeegee during the print stroke....................................
The finished print of how SILKSCREEN We hope to be bestowed upon satisfaction
Step C
Follow the directions found in the section "Making Prints."
Press down on the screen frame to insure complete contact with all cutouts. Make your first print. You will find with the first pass of the squeegee, the ink will cause the cutouts to stick to the underside of the screen creating a stencil effect.
Once you see how simple this method is, you may wish to try variations by creating two or three designs with torn paper of various shapes and printing each in a different color or hue. Do not overlap cutout pieces on the screen.
For intricate cutouts and small pieces, you may use school paste or rubber cement to adhere them to the bottom of the screen. NOTE: Generally ten to fifteen prints can be satisfactorily produced by this method. When a larger number of prints is desired, you should use one of the more "permanent" methods.
. . 2 . SCREEN FILLER METHOD
Direct block-out or "Negative Method"
Using Screen Filler is another simple means of preparing a screen for printing. The Screen Filler is used to block out those areas which you do not wish to print. This allows the ink to be forced through the screen whenever the Screen Filler has not been applied
Step A
On a sheet of plain paper, make up the illustrations or message you wish to print with your screen. Place this layout on a table top. Place your screen over this layout and trace your design directly on the screen fabric with a soft lead pencil.
Step B
Stir the Screen Filler until it is thoroughly mixed to a smooth consistency. Select an appropriate brush. This will be determined according to the type of line or texture to be produced. You can work on either the front or back of the screen. Be certain that bottom of screen is elevated-not touching table. Paint areas of the layout that you do not want to print. When all areas to be blocked out are covered with Screen Filler, flip the screen over and smooth out places the Filler may have collected on the opposite sideof the screen. Be careful during this smoothing out not to distort your work.
Step C
Leave the screen to dry in a level position. Make sure nothing touches the areas covered with Screen Filler Thorough drying is necessary. Overnight drying is recommended to assure best results.Check for pin holes in the blocked-out areas. You can do this by holding the screen up to a light. Fill any pin holes with Screen Filler and allow to dry completely. You are now ready to print. NOTE: Since Screen Filler is applied to all areas which are not to be printed, this-along with all traditional "direct" methods-is considered to be a "negative" method of printing. Your print will be the opposite of that which you created in your screen.
. . 3 . DRAWING FLUID - SCREEN FILLER METHOD
Tusche-resist or " positive!' method
Step A
On a sheet of plain paper, make up the illustrations or message you wish to print with your screen. Place this layout on a table top. Place your screen over this layout, top side up. Trace your design directly on the screen fabric with a soft lead pencil.
Step A-Alternative
The preparation of a layout is to help guide the application of Drawing Fluid. If you feel such a guide is unnecessary, go directly to step B.
Step B
Select an appropriate brush. This will be determined by the type of line or texture to be produced. You can work on either side of the screen. Remember, however, that your printing will be done from the top (or "ink-fill") side of the screen.
Be certain that screen is elevated-not touching table. Paint the Drawing Fluid over those areas of your layout that you want to print. Leave the screen to dry in a level, flat position. Make sure nothing touches the areas covered with Drawing Fluid.
Step C
After the Drawing Fluid is completely dry, open the Screen Filler and mix it thoroughly to a smooth consistency. Spoon it onto the screen fabric on the same side of the screen used for the application of Drawing Fluid.
Use the squeegee or the plastic spreader to apply an evenly smooth coating over the entire screen. One pass should be sufficient. Multiple passes of Screen Filler will dissolve the Drawing Fluid and prevent character washout.
Again, put the screen to dry in a horizontal position making sure nothing touches the fabric. It is important that the Screen Filler dry completely.
Step D
When the Screen Filler has thoroughly dried, spray cold water on both sides of the screen. Concentrate the spray on the areas where Drawing Fluid was applied. These areas will dissolve and the screen will become open at those points so that ink can flow through them.
If some areas remain slightly blocked, scrub them lightly with a small stiff brush on both sides of the screen (an old toothbrush will do a good job). DO NOT USE HOT WATER DURING THIS STAGE. Allow your screen to dry in a level (horizontal) position, bottom-side up.
Drying time may be accelerated by using a hair dryer or fan.
You are now ready to print. Follow the directions found in the section, "Making Prints."
. . 4. PHOTOGRAPHIC EMULSION METHOD
Use polyester or other suitable synthetic fabric or screen material. Do not use silk or organdy if you wish to reclaim the screen.
This is one of the most exciting methods of Screen Printing because it offers the widest range of possibilities. It makes possible the printing of fine line drawings, various hand and commercial lettering techniques, as well as photographic half-tone positives.
All methods of photographic Screen Printing require three things: (1) a screen prepared with a light-sensitive coating, (2) a film positive, or equal, and (3) a light source that will enable you to transfer the opaque images on your positive to the light-sensitive screen you have prepared.Let's examine these requirements.
Step A--Mixing the photo emulsion
SPEEBALL DIAZO SYSTEM:
SB4558 Diazo Kit Follow the mixing instructions given on both containers. Store the sensitized emulsion in a cool and dark place. Shelf life for the sensitized emulsion is 4 weeks at 90 Degrees F 8 weeks at 70 Degrees F and 4 months when refrigerated.
Step B Coating the screen
Coat the screen by first pouring a bead of the solution on one end of the bottom side of the screen. Spread it evenly and thinly with the squeegee or the plastic spreader. Use more solution where necessary. Pour a bead of the solution on one end of the inside of the screen and spread it evenly with the squeegee or the plastic spreader. Work to achieve an even continuous coating on both sides of the screen fabric. Perform the final spreading on the inside of the screen. Return any excess solution to your mixing container.
Step C-Drying the coated screen
In an area AWAY FROM LIGHT AND HEAT, set the screen to dry horizontally, bottom side down. This will provide the most even, flat "film" on the underside of the screen. It will, however, require your elevating the four corners of the underside of the frame during the drying stage with push pins or other suitable devices. An empty drawer, cupboard, closet, or under a cardboard box will work fine. Allow the screen to dry thoroughly. If more than 300 prints are to be run, it is best to apply a second coating of the sensitized Photo Emulsion to the bottom of the screen after the first coat is dry. Remember, work for a smooth, even THIN coating. Repeat the drying process away from heat and light.
Once the sensitized screen is dry, it must remain in a darkened area until it is ready to be exposed. A fan in the dark area will greatly speed up the drying of the emulsion on the screen.
Step D--Preparing a positive
With the SPEEDBALL Bichromate System, the maximum allowable time between application of the sensitized emulsion to the screen and the exposure is 6 hours at room temperature. With the SPEEDBALL Diazo System, the maximum allowable time is eight weeks at room temperature.
A "positive" is any opaque image (usually black), on any transparent or translucent surface. There are many ways you may choose to prepare them.
A excellent transparent film for this purpose is Wet Media Acetate . Wet Media is available in various sizes.
SPEEDBALL Screen Printing Craft Kits include both plain and printed tracing paper. The printed sheets (positives) have copy and illustrations that may be used to create a picture or message. With the plain sheets, you may make art work of your own with Speedball Super Black Ink and an artists' brush or SPEEDBALL pens. Excellent results can also be obtained by using dry transfer or pressure sensitive letters and symbols . These can be applied directly on the tracing paper or clear plastic. The graphics must be opaque to light.
Another way of producing positives is through copy machines that have the capability of reproducing very opaquely on film, tracing paper, etc. In order to satisfactorily produce a positive using a copy machine, the following conditions must be met:
. (1) Black and white line work-Must be opaque.
(2) Photographic print-Must have high contrast.
(3) Copy machine must have capability stated above. You must check this out in advance. Photographic images can also be accurately screen printed.However, because of the half-tones (or continuous tones) which are in all photographs, a special type of "positive" must be prepared. This must be done by someone with photographic expertise and who has the necessary equipment.
Essentially, this person will photographically transfer the halftones to Kodalith Ortho film. A dot patterned half-tone screen will be placed between the lens, and the ortho film. These "half-tone" dots will be exposed to the film simultaneously with the photograph.
The resulting "half-tone" negative will then be converted by the photographer to a "half-tone" positive.
This is the same type of "conversion" that is made in the preparation of photographs for newspaper and magazine printing. The dot pattern breaks up the continuous tones into a half-tone interpretation that can be printed.
Fine art half-tone screen printing involves a posterization process whereby a series of selected positives are produced through a process camera. With filters, the process camera can selectively identify specific colors in the original art. These are then, sequentially prepared for color registry. This is a highly technical procedure and should be attempted only by experienced printers.
For an in-depth treatment of photographic screen procedures, we highly recommend the book, "Screen Printing-Contemporary Methods and Materials" by Frances and Norman Lassiter This book 00 is available at most artists' materials stores.
Step E
Before you remove the sensitized screen from the dark drying area, make sure everything you need to print with is on hand. Set up your exposure lamp as described in step F Copy and illustrations (positives) can be fixed in place with cellophane tape. Do not let two layers of tracing paper overlap. A better alternative than taping the "positives" to the screen fabric is to lay a piece of clear glass, lucite, or plexiglass on top of them. One of these must be used if thin lines or lettering less than 1/4" tall is to be printed. Which ever you use, once you are all "positives" are in place and against the fabric, you are ready to expose the screen.
A screen using positives made tracing paper and india ink could now look something like this:
Step F-Light source
To set up your "Light Station" place the screen on top of a piece of black paper and center it 12 inches directly below a 150W clear incandescent bulb or a BBA No.1 Photoflood (preferred) Bulb. Either should be fitted with a foil-type pie tin as a reflector.
The positive can be placed in contact with the coated (dry) screen by either of the above methods.
Figure F-1 does not require the foam rubber cushion and the positive will read "correctly" as it's positioned in the screen frame.
Figure F-2 employs the use of a foam rubber cushion which is cut to the inside dimensions of the screen frame. The positive is placed in reverse (mirror image) on top of the underside of the screen.
SPEEDBALL SCREEN PRINTING SYSTEMRecommended Exposure Chart (Revised 1/77)
150 Watt Bulb, Clear Incandescent
Screen Size . 150W Bulb Height . . Exposure Time
8"x10" . . . . . . 12 inches . . . . . . . . . . . . 45 minutes
10"x14" . . . . . 12 inches . . . . . . . . . . . . 45 minutes
12"x18" . . . . . 15 inches . . . . . . . . . 1 hr. 14 minutes1
6"x20 . . . . . . 17 inches . . . . . . . . . 1 hr. 32 minutes
18"x20" . . . . . 17 inches . . . . . . . . . 1 hr. 32 minutes
BBA No. 1 Photoflood (250 Watt)
Screen Size . . Lamp Height . . Exposure Time
8" x 10". . . . . . 12 inches . . . . . 10 minutes
10"x14". . . . . . 12 inches . . . . . 10 minutes
12 "x 18" . . . . .15 inches . . . . . 16 minutes
16"x2O" . . . . . 17 inches . . . . . 20 minutes
18"x2O" . . . . . 17 inches . . . . . 20 minutes
PLEASE NOTE:
This chart has been prepared using an aluminum foil pie-plate reflector as indicated in our instructions.
More sophisticated light sources, reflectors and equipment can, of course, be used. However, as any variable is changed, you will have to adjust the exposure times and distances. This will require experimentation through the use of test strips or other light testing devices or procedures.
Turn on the light and note the time. Expose according to time and distance indicated in chart. After exposure, remove positive and take screen to sink.
Step G
Apply a forceful spray of water (body temperature) to both sides of the screen. DO NOT USE HOT WATER. Concentrate this spray on the light images on the top side of the screen. After a few minutes, these areas will become "open." Continue spraying until all unwanted emulsion is gone. Once you have completely washed the screen, let it dry thoroughly in a level flat position.Hold the dry frame to the light and check for pin-holes. These can be covered with Speedball Screen Filler or pieces of masking I stuck to the bottom of the screen. If Screen Filler is used, let the screen dry again. Follow the directions found in the section, "Making Prints." NOTE: Photo Emulsion should not be left in the screen indefinitely unless a permanent stencil is wanted.It should be washed out as soon as the run is completed. See Clean-up instructions on page 6..............
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