Dissolve 3 1/2 lb. clear good rosin in 1 gal. oil of turpentine. Darken, if required, by adding well-ground umber or fine lampblack. Oak varnish is used for common work. It dries generally in about 10 hours, though some is made to dry in half the time, and known as "Quick Oak Varnish"; another variety is called " Hard Oak Varnish," and is used for seats.