This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
Pure turps......... 6 pints
Copal varnish...... 1 pint
Good gold bronze.. . 6.5 pounds
Calcis hydrate (dry-slaked lime)...... 0.5 ounce
Mix the varnish and turps at a gentle heat, then slake well with the lime, and settle for a few days, then pour off the clean portion and mix with the powder.
White hard varnish. 1 gallon
Methylated spirit. .. 0.75 gallon
Gold bronze....... 12 pounds
Finely powdered mica............ 3 ounces
Mix the varnish and the spirit, reduce the mica to an impalpable powder, mix with the gold, then add to the liquid. Many bronze powders contain a goodly
proportion of mica, as it imparts brilliancy. Powdered mother-of-pearl is used also.