Does anyone know of a product for a resin photoresist that
is exposed, then developed? I've googled many of the iron on kind,
but this just won't pick up the detail of a photograph.
Karen, the old standby, before the easy iron on products, was Kodak
KPR photoresist. It's a liquid. While liquid, stored in a brown
bottle, it's not expecially photo sensative (but don't store it out
in the sunlight.). You get your plates properly clean (water sheets
off, etc.), and dry. Coat the plates with the liquid, and hold then
vertically to drain, giving the thinnest possible layer. Do the
coating and drying, and subsequent handling, either in darkness, or
a standard red light photo safe light environment. Drying is speeded
with a drying box, which amounts to warm air from a hair dryer blown
into the box in which the plates are standing up on edge. After
drying, handle only in darkness or subdued red safelight
conditions. Place your hight contast negative emulsion down to the
plate, and clamp in an exposure frame for exposure. Traditionally,
exposing is done in commercial units using arc lamps, but sun lamps,
or even sun light will work. You'll have to figure out exposure
times by trial and error if not using commercial exposure setups.
Then, in the red safelight environment again, develop the plates with
Kodak KPR developer, or another compatible developer (there are
several), allow the developed and washed plates to again dry, to
harden the resist layer, and you're ready to etch. Done well, this
material is capable of holding microscopic details (Not sure if it is
still used in semiconductor manufacture, but at one time, it was.
Certainly, you can do plates that will print a high resolution
halftone image with ease.)
I last used this stuff in grad school, in the late 80s, so I cannot
help you with a current source, and it's not likely to be a local
camera supply store item. Might be in a commercial graphic arts
place, and certainly is still available from the sorts of
commercial/industrial suppliers that would carry such things.
Whether you can find that just on the web, I don't know, since it's
not generally a consumer level item. You might try the Thomas
Register site, or just call Kodak to find a distributor near you.