In a message dated 1/10/2006 7:01:40 P.M. Central Standard Time,
pharmapack@... writes:
what kind of "photo-sensitising" you did on the
aluminum.
This was at least 25 years back, but I THINK I used the General Cement (?)
firm's photosensitive spray. It comes in a small aerosol can, and sprays on
as a transparent pink, and one must of course do that in subdued light. Then
cover it with a box or something to let it dry overnight. The stuff I used,
as I recall, had to then be exposed with UV or sunlight for a considerable
time, compared to "photography exposing", with the negative-film held flat on
it in a contact-exp. frame. I have since seen pre-sensitized PCB stock in
4x6" and up pieces advertised on the ad-pages of hobby-electronics type mags.
NO clue how those work; faster, or what.
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