A recipe for a waterproof harness composition is: In a glazed vessel melt 2 oz. of black resin over a fire and add 3 oz. of beeswax. When thoroughly amalgamated, remove from the fire, and add 1/2oz. of fine lampblack and 1/2 dr. of Prussian blue in powder. Stir well together, and add sufficient turpentine to form a thin paste. When cool, apply with a sponge and polish with a soft brush.