ASPHALT COVERING VARNISH

For covering the reverse sides of copper and zinc plates. Made from filtered bitumen and turpentine spirits. Fast drying, brown, tending to black, opaque. Apply evenly with a soft brush. Soluble, washes out with turpentine spirit. If a thinner consistency is desired, turpentine oil can be added to the covering varnish. 1 litre can.