#602. Varnish for Iron Work

- By Formula pot

Ingredients

  • Refer procedure

Procedure:

To make a good black varnish for iron work, take eight pounds of asphaltum and fuse it in an iron kettle; then add five 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. Now add one and a half pounds of dark gum amber, and boil for two hours longer, or until the mass will become quite thick when cool, after which it should be thinned with turpentine to due consistency.