Show VARNISH FOR IRON WORKS put 28 pounds of asphaltum into an iron pot and boil it for four hours during the first two hours of boiling introduce 14 pounds of 3 pounds of dried copperas 10 gallons of boiled linseed oil 8 pounds of resin and I 1 pound of the sulphate of zino zinc after four hours of boiling these ingredients should be of a thick consistency it is then suffered to cool and when cold it is thinned with turpentine so as to be applied with a brush it is is used for blacking the iron work of carriages ac of course the quantities given may be reduced if the proportions are retained |