I did a bit of this in my college days. We used orthographic film (Kodalith, I think) that was not sensitive to reds and had very high contrast. It was fairly easy to use for me and give great results. I made contact prints from mylars taped with Bishop tapes and pad layouts. I used it under a ruby light with a carbon filament. (Something my Dad had in his basement photo area, along with an old enlarger and developing trays.) Ahh! The good old days.
Andy
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Tuesday, April 12, 2016 4:23 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: RE: [Homebrew_PCBs] images for photoresist
That is simple to develop.i haven’t done it in a while but it was d76 developer , stop bath and fixer . you have to work in total dark until the fixer. If the size is 8 by 10 you could put it in a photo processing drum and let a motor do it for you. You would just need to drain the chemicals at the proper time.
A friend of mine used to do it with lithograph film . I don’t think it was as touchy and it could be handled under a yellow light if I recall.
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew! _PCBs@yahoogroups.com]
Sent: Tuesday, April 12, 2016 5:24 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] images for photoresist
On Tue, 12 Apr 2016 17:13:31 -0400, you wrote:
>I'm using laser transparencies for photoresist boards and I would like toYou want a professional place, one that does drawings, engineering
>test a real photographic film image. I understand real film has solid black
>this is excellent at blocking light. Can anyone suggest a type of place
>that can do photonegatives from a .jpg or .bmp? Can a CVS or Riteaid do
>this?
prints, and the like. They're likely to have the ability to make the
image. Photolithographers, for instance. Riteaid or CVS barely know
how t! o develop Tri-x Pan.
Harvey
>
>Jeff