A new type of
Developed by Keith Howard,
using a new film from DuPont.
General Processing Guide
The Intaglio-type represents a new family of printmaking techniques
developed by Keith Howard, that allows a great variety of image making possibilities.
Intaglio-type techniques utilize ImagOn in conjunction with conventional etching presses
and traditional etching inks. ImagOn can be used for all photo-generated imagery from high
quality halftones to computer generated images, even simple photocopies, to achieve the
highest quality photo-intaglio print. Painting and drawing techniques can also be achieved
by working with drafting Mylar. A large range of subtle ink and gouache washes can also
easily be transformed into print. Intaglio-type techniques with ImagOn represent a
departure from traditional intaglio plate making, and offer the printmaker unparalleled
image-making capability without compromising health, safety or the environment.
Studio Lighting for Using ImagOn Film
Keep ImagOn away from Ultra Violet (UV) light sources and direct
sunlight. Low ambient lighting can be used without exposing ImagOn provided that the
preparation process is carried out in less than 30 minutes. Cover windows with a red or
yellow plastic translucent shower curtain or prepare ImagOn for the plate under
incandescent light. After ImagOn is developed, there are no light restrictions.
As with all photopolymers, avoid direct contact with film by wearing
rubber gloves. Do not heat above room temperature. When working with chemicals, it is
always recommended to wear eye protection. See Safe Handling Guide for more detail.
- Plant spray mist bottle
- Isopropyl rubbing alcohol (70% solution)
- Intaglio plate (plastic wood or metal)
- 320 Grit sandpaper
- Blank newsprint paper
- Extra sharp trimming knife
- Etching press and blankets
- Soda Ash (sodium carbonate)
- Gram scale or teaspoon
- Liter or quart measuring container
- Two photo developing trays
- Conventional etching inks and paper
- Dish washing sponge
- Neoprene rubber gloves and eye protection
Cut the plate to your intended image size before adhering ImagOn. If
ImagOn is to be laminated onto a copper or steel plate, it must be thoroughly cleaned by
sanding with 320 grit wet and dry sandpaper and wiped with a dry clean cloth. Take care to
ensure that finger prints are not transferred to the surface of the copper plate.
Thoroughly clean any other type of metal plate with Comet or Ajax Cleanser and kitchen pot
scrubber. Use a 50% water and alcohol solution to clean plastic plates.
2.ImagOn Preparation Prior to Lamination
Cut ImagOn slightly larger than the size of the plate. Handle ImagOn
carefully to avoid dimples in the film. The inside peel back layer has a soft feel
somewhat like plastic wrap; the outside Mylar layer has a stiffer feel similar to
cellophane. Remove the inside peel back layer. Place the ImagOn with the outside Mylar
down onto a smooth etching press bed. Use a plant spray mist bottle to spritz the exposed
surface of the ImagOn liberally with a solution of one part 70% isopropyl rubbing alcohol
and three parts water. If the relative humidity is high, ImagOn will adhere without this
3.Laminating the ImagOn to the Plate
Hold the plate upside down about 2 inches above and parallel to the
dampened ImagOn and drop it onto the film surface. Trim the edges of the ImagOn with a
sharp cutter. Set the pressure of the press slightly tighter than required to print a fine
aquatint. Lay a clean sheet of newsprint on top of the plate before lowering etching
blankets. Run through the press at about one foot every 12 seconds. Carefully trim the
laminated ImagOn flush with the plate edges, cutting in a way that will not cause the
edges of the film to lift away from the plate.
When exposing artwork to the plate, the emulsion side or photopositive
of the artwork is facing down. Various Ultra Violet (UV) light sources can be used to
expose ImagOn to the art work, including sunlight and photo flood lights, however, it is
difficult to obtain consistent results. Absolute exposure control is important to optimize
image results, therefore, a professional exposure unit or plate burner with a built in
light integrator and point light source is recommended. A good vacuum in an exposure unit
produces the best contact between the halftone film positive or art work and ImagOn. A
400W Mercury Vapor lamp positioned about 14" away from a vacuum frame requires
exposure times of 15 seconds to 1 1/2 minutes depending upon the artwork used. A 1000 W
Clear Metal Halide lamp in a non-commercial unit requires from 3 to 20 seconds. It is
essential to make step tests to determine the correct exposure for the various
Intaglio-type techniques. Once "optimum" exposure times are determined, post
them on the side of the exposure unit for reference.
5.ImagOn Developing Solution
Use only the anhydrous variety of soda ash powder (sodium carbonate)
available from swimming pool chemical supply companies. Add 10 grams of soda ash powder
(approximately one level teaspoon) to about 4 teaspoons of hot water and stir until
dissolved. Add room temperature water to make a volume of 1 liter or use ?? teaspoons of
soda ash to make 1 quart. The working temperature of the developing solution should be
about 65-70°F. Pour into a photo developing tray.
Remove the Mylar layer from the ImagOn, then place the plate into the
developing solution. Wearing gloves, rub with a dish-washing sponge for about 2 minutes.
The unexposed areas of ImagOn will wash away in the developer, leaving valleys and grooves
in the remaining ImagOn characteristic of an intaglio plate. Knowing precisely when the
image is developed is a matter of experience based on visual inspection and the tactile
feel of ImagOn. Rinse the plate under running water, squeegee off remaining water, then
leave to dry naturally in a vertical position.
7.Harden the ImagOn Plate
ImagOn must be light-hardened using UV light before inking and printing.
The time necessary varies, but is at least double the exposure time for a halftone image.
The minimum light-hardening time for the 400 W Mercury Vapor exposure unit is 90 seconds;
for the 1000W Metal Halide exposure unit, 20 seconds. Two to five minutes in direct
sunlight is also a good alternative. ImagOn has fully hardened when its blue color
8.Final Edge Preparation
To add a crisp edge to the image, bevel the edges of the ImagOn on the
plate with 320 grit sand paper and a small block of wood or an electric finishing sander.
Hold the sanding block or finishing sander at a 45° angle.
9.The ImagOn plate is now ready to be printed in the
conventional Intaglio manner.
10.Removal of ImagOn
After the print has been editioned, the plate can be completely
reclaimed by cleaning off the etching ink with vegetable oil, then leaving the plate to
soak overnight in old ImagOn developer. When the ImagOn lifts from the plate, rinse it in
water.. A final cleaning can be done with Comet or Ajax Cleanser. A 4% soda ash solution
takes from 30 minutes to 2 hours to remove ImagOn.
Questions & Ordering Information
ImagOn is manufactured by DuPont and distributed through Praga
Industries. For more information about using ImagOn or to place an order, call
800-844-9421 or contact the Praga World Wide Web site at
The information set forth herein is based on data believed to be
reliable, but the DuPont Company makes no warranties express or implied as to its accuracy
and assumes no liability arising out of use by others. This publication is not to be taken
as a license to operate under, or recommendation to
infringe, any patent.
Compiled by Keith Howard; 7/96 e-mail email@example.com
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