Hi again Zby:
I was able to dig up 3 methods of making paper translucent. I am not sure what Gum-elemi is, when I looked it up in the glossary, it said "resin" ...
Anyways - here it is:
From 1908 Photographic Annual: Figures, Facts & Formulas
"Making paper translucent: powdered resin, 4 z; gum-elemi, 4 oz; paraffin wax, 2 oz; rectified spirit of turpentine. 12 oz; Place in a large clean enameled saucepan, and heat over a fire or gas stove, with constant stirring, until mixture boils and froths up to to fill the pan. Allow to cool a little , then add another 12 oz of rectified spirits of turpentine, stir thoroughly, then pour into wide mouthed bottles and cork well. In the melting there is a liability for the mixture to catch fire ( especially if the stirring is slackened), therefore a close-fitting lid or flat board large enough to cover the top of the pan should be kept at hand during the melting. To use, lay the prints face downward on clean blotting, and stretch with drawing pints on a board. Use a broad flat brush well charged with the varnish and with a few sweeps quickly cover the whole back of the print, then let dry. If white spots appear, give another coat of the varnish.
Pour melted paraffin wax over warm prints in a hot zinc dish, paper side up - drain before fire and dry.
Smear paper side with vaseline, lay on blotting paper and iron several times."
You might find something on one of the Alt Process Forums as Annie suggested.
I hope this is a good start at least
- John