>1. It says use 1 teaspoon of gelatine to a pint (500 cc) of
>water. This is surely an error, because that's 4 grams, or less
>than 1% solution, which doesn't do anything, doesn't even set
>when cold. I figure at least a 3% solution, but can someone say
>for sure?
This sounds similar to my problem of trying to get gelatin to stick to plastic
sheets. I tried coating plastic sheets with a gelatin solution mixed with
varying amounts of sugar. The more sugar I added the longer the emulsion would
adhere to the sheet, but it would eventually release. Since the sugar holds
more water in the emulsion it seems that there may be something to the idea of
mixing a sub layer of gelatin that would hardly set. I'm thinking that a very
dilute solution of gelatin coating the glass might not form a coherent enough
film to shrink and pull away from the glass, but would give a subsequent coat
something to hold onto. This is pure speculation, but could be an interesting
experiment.
Anyway, I exchanged e-mail with Rae Adams a while back with regards to getting
gelatin to stick. She sent me a collection of chemical treatments that she had
found in her research. However, the idea that seemed the simplest was to try
using albumen as a sub coat. If you try this, I'd appreciate hearing about your
results.
I think there may also be a discussion in the Keepers of Light under the
Collotype process on getting gelatin to stick to glass.
Hope this helps a little.
- Wayde Allen
(74160.3410@compuserve.com)