In "How to Make Old-Time Photos," there is a formula for gum bichromate
print
where fish glue is added. The author mentioned the formula and then said
that
the processing is the same as regular gum bi. My question is what is the
reason for adding this fish glue? What principle are we looking at here?
Why
don't we use the simple gum+dichromate mix?
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Try a print industry supply house where fish glue is used as a resist.
Lepages Glue is still marketed by Hunter Penrose. It has a beautiful
label.
My owm experiments indicate that the fish glue gives a softer final print
than gum arabic.
Terry King