Henk and Gord et al, Our % gel coats differ to some extent; yours ammounting to a thicker deposit than mine. I have tried two coats of 10% and I do use Fabriano 5. 350 gsm. Its a nice surface. I should emphasize that my addition of 2% Citric acid does make it easier to brush on the gel. More than 2%, up to 25% , and you have a very, very slow setting glue solution similar to Gum.
The sensitizer:- I note that you brush it on rather than by immersion. I will try brushing a one to one solution of alcohol to 2% Amm Dich. (1% final solution)
Regarding my initial tests with alu sheet:- I have two disasterous results which I will keep:-
1. Exposed for one hour. Had to almost boil it to get the gel to swell. Looks like a black and white chequer board.
2. Exposed for 15 minutes. Still needs less UV. Will give it 8 minutes, next time.
The alu sheet is easier to handle than paper but needs more careful coating to avoid streaks. I did not use a substrate for the gel coat but will increase the surface keying with carborundum powder and apply two coats. Also thinking that a dip in 1% Chrome Alum for hardening might make the matrix more resilient.
More later.John.
----- Original Message -----
From: henk thijs
To: alt-photo-process-l@usask.ca
Sent: Friday, May 26, 2006 12:58 PM
Subject: Re: oil prints -selective inking
With the gelatine I was messing around for weeks until I found that I needed at least 3 to 4 coatings of a 6% gelatine (the ordinary one from the supermarket) .
The sensitizer : I tried am.dichromate dissolved in 90% alcohol as written in the books, but switched to a 5% pot. dichromate , using a foam-brush. (next I will try John's 1 percenrt am.dichromate ; sounds good to me)
For exposing times : in relation to the gumprints I made with the same negative I had to double the time.
The paper: here I also tried a lot, but I found as the best suited for the p[rocess was Fabriano no % , but only the 350 grs. But also here the idea of John is a good one for a start.
Succes,
Henk
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Received on 05/26/06-07:40:28 AM Z
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