Manufacturer and Builder 1, 1890
A Good Black Varnish for Iron-Work, says an exchange, is to take eight pounds of asphaltum and fuse it in an iron kettle, then add two gallons of boiled linseed oil, one pound of litharge, half a pound of sulphate of zinc (add these slowly or it will fume over) and boil them for about three hours. Then add one and a half pounds of gum amber, and boil for two hours longer, or until the mass will become quite thick when cool. After this it should be thinned with terpentine to the proper consistency.
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