Considerable manufactories have, it is said, been established in France, for the construction of a variety of articles with this substance. The gelatine is usually obtained from bones, by treating them with a weak solution of muriatic acid; and it is afterwards tanned by the common process, as in making leather. Upon becoming hard and dry, it assumes the appearance of horn or tortoise shell, and is employed for the same purposes as those substances. It is softened by being boiled in water with potash, when it may be formed into any shape, and the figure preserved by drying the articles between moulds. In the soft state, it may also be inlaid with gold, silver, or other metals, and is streaked with various coloured materials, so as to resemble the finest woods and other natural productions.