A weathered or aged appearance occurs naturally over time as the patina is enhanced. Cleaning and conservation in 1988 have restored their original antique bronze patina. A chromic acid dip leaves behind a bright yellow patina on the brass. The finish was sandblasted to ensure even weathering for an amber patina. The copper has since acquired its characteristic green patina. In time it turned black, with only patches of preserved green copper patina. The surface of a racket will develop a smooth glossy patina with use. The sculpture was cleaned of its former somewhat oily patina. Engravings were effected by chiseling through this patina, exposing the lighter rock underneath. Furthermore, the particularly fine grain gives the armchair a unique patina over time. Today, treen is highly collectable for its beautiful patina and tactile appeal. Joachim Splichal's landmark fine dining restaurant Patina designed by Belzberg Architects. Kuro-shibuichi will develop a black patina which is different from the black patina of shakudo. They had rebranded as Classic Springer, some with a false "Masterpiece Theatre"-like theme and patina. She is portrayed by Patina Miller.