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Re: Chlorobromide & Dassonville Charcoal black paper
At 2000/03/27 09:35 AM -0800, you wrote:
>First of all since I'm starting from scratch ANY Silver formula would be
>interesting. I don't need Ilford's secrets. Is this Silver Cloride contact
>speed formula that secret? I'm sure the chemists on the list already have
>an idea what is in it. silver nitrate, etc.
>
>I want hand coating so it doesn't look like it was applied at a factory.
>That's my attraction to alt.
>
>There must be some formulas in public domain after 50-100 years?
There are dozens of classic silver formulas available - all the
"Historical" type photo books and most general alt photo books have
formulas for "salted paper" which are just silver emulsions. I personally
use a classic formula of ammonium chloride and gelatin to soak the paper,
then when dry, apply silver nitrate. It's that easy, and the results can be
great. In fact, if you use a gold solution (fancy "toners" aren't
necessary) after a short wash and before fixing, the image is quite permanent.
Sil Horwitz, FPSA
Technical Editor, PSA Journal
teched@psa-photo.org
silh@earthlink.net
Visit http://www.psa-photo.org/
Personal page: http://home.earthlink.net/~silh/