[alt-photo] Re: Alternative sensitiser

[Philippe Berger]

see here a Carbon Skin
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----- Original Message ----- 
From: "sam wang" <samwang864 at gmail.com>
To: "The alternative photographic processes mailing list" 
<alt-photo-process-list at lists.altphotolist.org>
Sent: Sunday, April 18, 2010 5:07 AM
Subject: [alt-photo] Re: Alternative sensitiser


> Peter,
>
> For years I was searching for a source for ammonium caseinate, which
> according to Franklin, should dissolve readily in water - he used what his
> research lab provided him. But all I could find was sodium caseinate, 
> which
> took some time to dissolve but worked quite well otherwise and eliminated
> the need to produce the casein from skim milk each time. Will have to see 
> if
> it still needs pH adjustment, but won't be able to do that till I get back
> home in a few weeks.
>
> Thanks again for all the information.
>
> Sam Wang
>
>
> I use a 5% casein solution made from skim milk/vinegar. It is dissolved 
> with
>> a small amount of sodium bicarbonate to get it into solution. I make sure
>> the final pH is around 7.
>>
>> The peroxide needed is very dilute (0.1%) If you go above 3% the print
>> actually will not develop as well, and it wastes a lot. ) 0.1-1% range is
>> good. You can add a small bit of ammonia to help with dissolving the
>> emulsion (as you know).
>>
>> I use a 1:1 casein/sensitizer ratio.
>>
>> I hope this will help.
>>
>> Peter Friedrichsen
>>
>>
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