This section is from the book "The Tinman's Manual And Builder's And Mechanic's Handbook", by Isaac Ridler Butt. Also available from Amazon: The Tinman's Manual And Builder's And Mechanic's Handbook.
Boil bitter-apple, freed from the seeds and cut five parts, with rainwater fifty parts, down to one-half. Strain and dissolve in the liquor gum arabic eight parts, and rock-candy four parts, and lastly, add one part of alcohol. Let it stand for some days, and filter.