Re: Gelatine is also '' a '' gum but not Gum.

Ha, John, been there, done that.

It was an old method to "speed" gum up. What it did was create stability in
the highlights, in other words, lotsa staining. The more acid, the more
staining. But I can imagine that back in the day when they were believing
that gum didn't give halftones and it produced "soot and chalk" images, that
it was a good enough technique, especially with the variability in negatives
they might have had..

I love those old gum recipes, additions of all sorts of stuff. I just had
an old book translated for me from the German on the egg white gum print, a
combo of the two. My translator has translated 4 such books now, 4 more to
go. They are a HOOT, these old books.

Do you think it is no longer a gum print, but an acetigum? A gumacete?
Chris

> Just to complicate the issue further I read in one of my old photographic
> dictionaties that a very useful gum can be made by adding acetic acid to a
> solution of gum arabic.
> Have a nice Spring, yo all. John - Photographist - London.
>
Received on Tue Apr 4 09:14:20 2006