From: Robkin, Eugene (erobkin@uwc.edu)
Date: 01/30/01-09:48:09 AM Z
Some circuit boards come pre coated with a photoresist. There are two
general kinds with lots of variations. The first becomes insoluble with UV
exposure and the other soluble. If you are buying old stock of the first
kind or new of the second then you may be dealing with a tough coating of
some sort.
The resists used in the electronics industry sometimes require fairly nasty
solvents to remove. Not likely to be something simple like hot water.
You can get boards without any coatings and these should be fairly easy to
clean. About the same as cleaning copper etching or gravure plates.
There are lots of nice polishing metal cleaners around but when you are done
with those you likely will have some sort of coating on the copper which
will require removal. If that happens to be a silicone coating of some
sort, and many are, then your project is doomed anyway. You may as well use
the old standard artists methods in the first place.
There is no royal road to geometry nor to shiny copper plates. The only
genuine elixir I know of is made in Scotland and can only be used for
polishing psyches.
Eugene Robkin
-----Original Message-----
From: Sandy King
To: alt-photo-process-l@sask.usask.ca
Sent: 1/30/01 3:02 AM
Subject: Re: On metal
>Walt wrote:
>
> Tarnished plates can be cleaned with Brasso. If you then clean with
>mineral spirits and degrease with whiting and amonia you can transfer
>directly to the plate in cold 65f and develope in 110f (at least with
>Aututype tissue).The cleaning should be done immediately before
transfer
>and dried quickly. This is how photogravure plates are prepared for
>etching. I imagine the plate would still have to be sealed as the
carbon
>image will let moisture through.
>
>Walt
The circuit boards I have must be different from regular copper plates
because there is something on (or in) them that will not clear up with
brasso, no matter how much I rub. What I am looking for is an elixir: I
drop the circuit boards in the elixir and 30 seconds later when I pull
them
out they are as shiny as a mirror. No swearing or cursing involved!
Sandy King
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