1) First, pre-soak and dry the paper to reduce dimensional
instability. This is very important for multiple printings.
2) To coat (5) 22X30" sheets of paper, first prepare about 500ml
of a 7% gelatin solution. Immediately before coating, raise the
temperature of the gelatin solutin to about 100 F. and add
50ml of a 5% chrome alum solution.
3) Before coating, re-soak the paper for a few minutes, then place
it on a relatively level surface and wipe off the water with a
clean towel.
4) Using about 100ml per sheet of the gelatine-chrome alum solution,
sprad it on the paper with a clean foam brush.
5) When the gelatin sets, hang the paper to dry.
You can adjust the % of the gelatin solution if this gives a coating too
thick for gum. Chrome alum does not harden the gelatin imnmediatley so you
should wait several days before printing with paper so hardened.
Sandy