This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
Manila copal, spiritsoluble............ 12 parts
Ruby shellac, powdered ............. 62 parts
Venice, turpentine.. . . 12 parts
Spirit, 96 per cent.... 250 parts
The materials are dissolved cold in a covered vat with constant stirring, or better still, in a stirring machine, and filtered. For the pale shades take light ocher; for dark ones, Amberg earth, which are well ground with the varnish in a paint mill.
Shellac, A C leaf, 1.2 parts;
sandarac, 8 parts;
Manila copal, 2 parts;
rosin, 5 parts;
castor or linoleic acid or wood oil acid, 1.50 parts;
spirit (96 per cent), 65 parts.