2899. Brunswick Black

2899. Brunswick Black. Foreign asphaltum, 45 pounds; drying oil, 6 gallons; and litharge, 6 pounds. Boil for 2 hours, then add dark gum-amber (fused), 8 pounds; hot linseed oil, 2 gallons. Boil for 2 hours longer, or until a little of the mass, when cooled, may be rolled into pills. Then withdraw the heat, and afterwards thin down with 25 gallons oil of turpentine. Used for iron-work, etc..

2900. Black Varnish for Iron-Work

2900.    Black Varnish for Iron-Work. Asphaltum, 48 pounds, fuse; add boiled oil, 10 gallons; red lead and litharge, of each 7 pounds; dried and powdered white copperas,

3 pounds. Boil for 2 hours; then add dark gum amber (fused), 8 pounds; hot linseed oil, 2 gallons; boil for two hours, proceeding as in the last receipt, thinning down with oil of turpentine, 30 gallons. Used for the same purposes as Brunswick black.

2901. Colored Oil Varnishes

2901.    Colored Oil Varnishes. Oil varnishes are colored by grinding with them the most transparent colors, as distilled verdigris for green, etc.. Spirit varnishes are also colored with dragon's blood, gamboge, etc.. (See No. 2867.)

2902. Varnish for Grates

2902. Varnish for Grates. To 2 pounds common asphaltum, fused in an iron pot, add 1 pint hot boiled linseed oil; mix well and boil for some time. When partially cooled add 2 quarts oil of turpentine. If too thick, add turpentine. Apply with an ordinary paint brush.