Excerpt from The Engineer's and Mechanic's Encyclop�dia, Vol. 2 of 2: Comprehending Practical Illustrations of the Machinery and Processes Employed in Every Description of Manufacture of the British Empire; With Nearly Two Thousand Engravings

Ivory is stained of various colours in the following manner: Red - Tah quarter of a pound of the cuttings of scarlet cloth, half a pound of sol soap; let the son be well rubbed into the cloth; then put them into a earthen vessel, an pour upon them two quarts of water; afterwards, boil the! For a considerable time, which will extract all the colouring matter. The clot may then be taken from the vessel, and the coloured li uor pressed out. Tl! Ivory to be stained is now to be dipped in aquafortis, t on in cold water, am from thence into the dye, whilst it is warm, which will stain it of a heautift red. Yellow - Boil the ivory in a solution of one pound of alum in two qull'l of water, then immerse them for half an hour in a liquid pre ared by bullitt half a pound of turmeric in a gallon of water, until it be reduce to three quart: and afterwards plun e the coloured substance into alum water. Gram - Tl! Dye bath for this colgour is best made of a solution of verdigris in aqua form the process, in other respects, may be the same as that described for yell? Blue - Dip the ivory that has been made green into a hot and strong sollim of pearl ashes, which will turn it to a fine blue Purple. Dissolve one em of sal-ammoniac in four ounces of aqua regla, to form the dye: prepare ti ivory, as in the yellow, by boiling it in a solution of alum. Ivory mayl silvered by immersing a sli of ivory in a weak solution of nitrate of silver, at letting it remain till the sqtion has given to it a deep yellow colour; tlu take it out, and immerse it in a glass vessel of clear water, and thus expose in water, to the rays of the sun: in about three hours the ivory acquires black colour, but the black surface, on being rubbed, soon becomes changed a brilliant silver.

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