"Patinas are variations of color, in general, they are on a background clear or pigmented. A low friction, can be ""jexées"" for aged or give a special appearance to the wood grains." The patina should absolutely be protected by a varnish or wax. The ceruse apply, generally, open pore wood to mark the grain of the wood and wipe in 8 to facilitate the penetration into the pores. They must be absolutely protected by varnish.