photo etcing litho blocks

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From: Gordon J. Holtslander (holtsg@duke.usask.ca)
Date: 10/01/01-02:05:44 PM Z

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

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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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