Mineral Black is a native impure oxide of carbon, of a soft texture, found in Devonshire. It is blacker than plumbago, and free from its metallic lustre, - is of a neutral colour, greyer and more opaque than ivory black, - forms pure neutral tints, - and being perfectly durable, and drying well in oil, it is valuable in dead colouring on account of its solid body, as a preparation for black and deep colours before glazing. It would also be the most durable and best possible black for frescoes.