Susan Groce 'Invasive Species', Intaglio Type Assemblage, click to enlarge
ImagOn (HD) TM, DuPont
A Note about using ImagOnHD
ImagOnHD represents the latest generation of photopolymer film designed to yield higher definition due to its transparent green emulsion.
ImagOnHD functions a little differently to other, older ImagOn films. The instructions for using other ImagOn films outlined in "Non-Toxic Intaglio Printmaking" will not work properly for this new film. The most essential element for successful use of ImagOnHD is to follow the instructions in Keith Howard's manual, The Contemporary Printmaker. This new film has basically the same instructions as for ImagOn ULTRA rapid. Before commencing, it is very important to test your soda ash developer, as outlined in Keith's book.
With ImagOnHD the emulsion is no longer blue but transparent green. Always make an exposure test. To lighten an image INCREASE exposure. To darken DECREASE exposure. On industrial exposure units always choose the lowest intensity lamp setting or filter the lamp with neutral density filters (#210) from www.leefilters.com. Ideally the Aquatint Screen exposure should be around 20 seconds. This is extremely important for achieving optimum results.
* ImagOnHD can also be dry laminated by removing the peel-back film layer: place the emulsion face up on to a sheet of pristine Plexiglas, then lay a plate on top and run through the press. Heat cure the plate as normal. ALWAYS mix ImagOn developer and LAMINATE the ImagOn to the plate the day before exposing and leave covered.
* ImagOnHD has a transparent green color making it easy to register 4 color Inversion Intaglio-Type plates. This transparent quality of the plate makes upside down plate sequence printing easier.
* ImagOnHD has the same developing process with a 9 minute still development in a 10gm soda ash to 1 liter of water solution BUT your image may benefit by an additional 1 minute gloved hand agitation using a soft dish-washing sponge.
* The ImagOnHD plate is fixed with white vinegar and washed with water as with the old film.
* Do not store the film in temperatures over 75 degrees F.
If you have any technical problems email: KeithHoward@KeithHoward.org
Photopolymer Film: Variations and Purchasing Options
The following Suppliers carry ImagOn dry Photopolymer film recommended by Keith Howard
There are other kinds of dry Photopolymer film that also work for Photopolymer Printmaking; often these are adapted from their original use in the printed circuit board industry as etching resists. All film are sandwiched between two layers of clear mylar and expose with UV light, and all films develop in a soda ash developing solution. Developing times, exposure times, film thickness and contrast / tonal range may vary from product to product. The thick variants of film are ideal for non-etch printing, while the thin varieties are best suited as a photo etching resist (such as Puretch).
Photopolymerfilm, UK (Photec)
Cape Fear Press, US (Puretch)
Photopolymer Film vs Solarplate
Some print studios and artists prefer the use of ready made photopolymer plates from the printing industry over the use of dry film. The process is very straightforward as the user does not have to go through the plate making steps. The quality of the photo-reprographic intaglio prints made by these plates can be outstanding. This is due to the thickness of the polymer emulsion and the high tonal range and fine detail facilitated by these ready made plates, especially if used with a good aquatint screen or a high quality halftone. However, plates tend to be expensive, and creatively the process is somewhat more limited than dry film photopolymer printmaking. First pioneered by Eli Poinsang in Denmark, the method was popularized by Dan Welden with his Solarplate process. Click here for details.
Safety Aspects of Photopolymer Films and Plates
Handling Procedures for DuPont Photopolymer Films TB-9944
Handling Procedures for Photopolymer Films (DuPont)
Incidence of Health Effects: ‘Numerous operators worldwide have handled DuPont photopolymer films daily for forty years, but DuPont has received only a few enquiries per year on health effects. Although not every instance of related health effects is reported, the records show that few cases occur.'
Health effects of Acrylates. DuPont as well as other manufacturers formulate photopolymer films with multifunctional acrylate monomers. Historical and toxicological information has shown that that multifunctional acrylate monomers can produce potential health effects…Overexposure to the acrylates in the films can have these known effects: Respiratory irritation / Skin Irritation / Skin sensitization
‘Casual contact does not appear to cause monomers to be transferred to the skin and absorbed in sufficient quantities to cause skin irritation...’
Heating of photopolymer films generates vapors, and the condensate resulting from these vapors, is responsible for virtually all reported health effects. To prevent exposure, equipment that heats the film must have an exhaust system that will remove vapors from the workplace and avoid the formulation of vapor condensate. Inhaling vapors from heated film may result in dryness and irritation of the respiratory tract. This is especially true if films are heated above their normal use temperature. More harmful effects are possible if normal safety precautions (e.g. laminator ventilation) are totally disregarded.
Click for the 'Grabado y Edicion' article Keith Howard: Llego la revolucion (2008)
Or visit the publication website: www.grabadoyedicion.com
Click for the 'Grabado y Edicion' article fotograbado con film fotopolimero (2008)
Or visit the publication website: www.grabadoyedicion.com
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