Re: oil prints -selective inking

Hi John,
Why do you 'sand' the aluminium? If you coat a very clean alu-sheet (I
did it with white spirit; just continue cleaning as long as it gives
black rubbish on your towel or whatever - oh this struggling with your
language, especially for the day-to-day words :-), and after that the
'pollmeier beer coating'.
In that case you have the chance to bring back a beautiful shining
surface in the end, after waiting about 8 month (!) you can use some
varnish and it is i.m.o. the only process in alt where you can compete
with a 'waterlike' result (you know, the gumprint in the water, such a
beautiful unreachable goal, or?)
Exposure times looks a bit long; did you try the neg. for example also
for gum?, or cyano?; just for a reference?
Succes.
Cheers, Henk

On 26 mei 2006, at 15:40, John Grocott wrote:

> 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
>>
>>>
>>>  ------------------------------------
>> www.thijs-foto.com
>> ------------------------------------
>>
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www.thijs-foto.com
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Received on 05/26/06-09:31:17 AM Z