Exposure times for YC Olec Exposure Unit

Materials:

Plate laminated with ImagOn

When using a new material like vellum as a substrate for an image, leave an area without the image so you can see if the problem is the developer or the development time.
To test when the substrate (vellum, mylar, lexan, oiled paper, etc.) is no longer affecting the ImagOn it is often helpful to test only the material to se when the material is o longer "recorded" by the ImagON.

Do not look at the light source as the strong light can do serious eye damage

make a step tests to determine the correct exposure for the various Processes
Perfecting exposure times, for the various elements within each technique, will result in optimum output results.
Determining which is the ideal exposure time, for any exposure unit, is a matter of doing a series of test exposure to determine the best results.
make test sample plates and print them in the intaglio manner.
Post the "optimum" exposure times on the side of exposure unit for future reference.

After an aquatint screen has been made it is important to expose it directly to a ImagOn laminated plate with incremental time segments then develop, dry, light harden this plate and then print it to see which exposure segment gives the best density of black.
The emulsion of the aquatint screen should face down in direct contact with the ImagOn emulsion.
Once the optimum exposure time for this black has been determined it generally remains fixed unless a gray tone is required rather than the black.
In any case your step exposure and final print will give you an accurate guide if you wish to exploit a range of tonal values in your aquatinted areas.
Generally speaking the longer the aquatint screen is exposed the lighter will be the finished aquatint.