Young's Demonstrative Translation of Scientific Secrets · Chapter 270524. A Fine Black Varnish

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Take 2 ozs. of bitumen of Palestine, 2 ozs. of resin, and 12 ozs. of umber; melt them separately, and afterwards mix them together over a moderate fire; then pour upon them, while on the fire, 6 ozs. of clear boiled linseed oil, and keep stirring the whole from time to time; take it off the fire, and, when pretty cool, pour in 12 ozs. of essence of turpentine. This varnish is for coaches and iron work.