From: Gary Beasley (beasleyglb@mindspring.com)
Date: 10/01/01-02:35:46 PM Z
At 02:05 PM 10/1/01 -0600, you wrote:
Try going to Radio Shack and see if they have any photo resist for doing
printed circuits. I think its supposed to resist acids. I know they have
resist pens for drawing the circuit and the etchant for the copper board.
We use photo etched dies at work for the letterpress processes (foil
stamping, embossing) so a look into the diemaking processes would be
informative.
>Hi:
>
>I am fiddling around seeing if I can do photo etching of litho blocks.
>
>I'm using a technique suggested in spirit of salts - using a
>gum-bichromate coating on a lino block to make a photo resist.
>
>I'm using caustic soda (NaOH) as an etcing agent - it etches out the
>resist. Has anyone had success with this?
>
>I'm thinking I should try a less vigorous etching agent. Oven cleaner was
>suggested in spirit of salts - but mine did no etching
>
>Also tried dichromated gelatin and white glue as resists. No success
>either - though the glue seemed to resist the caustic soda the caustic
>soda seemed to etch under the glue.
>
>Gord
>
>---------------------------------------------------------
>Gordon J. Holtslander Dept. of Biology
>holtsg@duke.usask.ca 112 Science Place
>http://duke.usask.ca/~holtsg University of Saskatchewan
>Tel (306) 966-4433 Saskatoon, Saskatchewan
>Fax (306) 966-4461 Canada S7N 5E2
>---------------------------------------------------------
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