[Fr.] The process of removing the color from textile fabrics and from many other materials used in the arts, such as oil, wax, and the various substances used in paper-making. The old method of bleaching was carried on by exposing the materials to the action of the sun's rays, while they were kept damp by frequently sprinkling thern with water; but since the discovery of the bleaching action of chlorine about one hundred years ago by Berthollet, a French chemist, bleaching has become a thoroughly scientific process. The two chief bleaching agents are bleaching-powder (or chloride of lime) and sulphurous acid.