Young's Demonstrative Translation of Scientific Secrets / Or, A Collection of Above 500 Useful Receipts on a Variety of Subjects

by Daniel Young

113. IRON WORK BLACK OR BLACK VARNISH FOR IRON

Put 48 lbs. asphaltum into an iron pot, and boil for four hours; during the first two hours, introduce 7 lbs. litharge, 3 lbs. dried copperas, and 10 gallons boiled oil; add 1/8 lb. run of dark gum, with 2 gallons hot oil; after pouring the oil and gum, continue the boiling two hours, or until it will roll into hard pills like Japan; when cool, thin it off with three gallons of turpentine, or until it is of proper consistence. This varnish is intended principally for the iron work of coaches and other carriages.

114. VARNISH FOR HARNESS

Take 1/2 lb. of india rubber, 1 gallon of spirits of turpentine; dissolve enough to make it into a jelly by keeping it almost new milk warm; then take equal quantities of good linseed oil, (in a hot state,) and the above mixture, incorporate them well on a slow fire, and it is fit for use.