Pine laths are generally finished with size and varnish, the latter alone imparting a sufficient hue. For a more pronounced tone, yellow ochre or lemon chrome may lie mixed with the size: for walnut, add Vandyke brown; for mahogany, add burnt sienna. For laths that have been already painted the use of sell colours is advised, such as green, blue,or yellow enamels, though, as a rule, special preparations are used, with turpentine or resin varnish as the basis. The varnish green with which Venetian blind laths are coated is made of ground mineral green, 2 lb.; white lead, 51b.; with turps enough to mix. Then add 71b. of turpentine varnish. Mix the other ingredients before adding the varnish.