Chinese furniture is mostly in plain polished wood, but from at least the Song dynasty the most luxurious pieces often used lacquer to cover the whole or parts of the visible areas. All the various sub-techniques of Chinese lacquerware can be found on furniture, and become increasingly affordable down the social scale, and so widely used, from about the Ming dynasty onwards. Carved lacquer furniture was at first only affordable by the imperial family or the extremely rich, but by the 19th century was merely very expensive, and mostly found in smaller pieces or as decorated areas on larger ones. It was especially popular on screens, which were common in China. Lacquer inlaid with mother of pearl was especially a technique used on furniture.