Katharine Thayer wrote:
>
>
> Pigmented gelatin has a particular look. Pigmented PVA has a different
> particular look. I don't find those looks beautiful or even interesting.
> It's only gum that interests me.
And (here's a speculation) I really do wonder if the particular limpid
depth of the unhardened gum is related to its solubility.
To be fair to chrome alum, it's true that as I add more chrome alum,
there is more of a hardening effect, and I probably mixed it too dilute
to start with, assuming that it would be similar to gelatin. (If I'm
reading Sandy's posts right, he hardens gelatin with a .2 % solution (2
grams chrome alum per liter of gelatin solution). The last mix I tried
was about 3% chrome alum to gum, and it looked promising as far as the
hardening effect, except that all the added water is changing the look.
kt
Received on Fri Mar 19 11:29:01 2004
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