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8                 :THE tABORATOFY.
it with a hair cloth, and wipe it over with a clean napkin,
or linen rag, moistened; in this let it lie, till it dries gra.
-dually, else it will.be.apt to split,
          Awther Method to whiten Green Ivory.
   BtOL the ivory in water And qpicklime, till you see it
 has a good white,
              To imitate Marble upon Ivory.
   MEL T bees-wax and tallow together, or else yellow and
 white bees-wax, and lay it over your ivory; then with an
 ivory bodkin, open the strokes that are to Imitate marble;
 pour the solution of some metal or other on them, and let,
 it stand a little while; then pour it off, and when it is dry,
 cover those strokes again with wax, and open some other
 veins with your bodkin for anotler metallic solution; and
 this repeat to the number of'colours you design togivc
 it.
   N. B. The solution of gold gives it a purple; of copper,
 a green; of silver, a lead-black; of iron, a yellow and
 brown colour. These solutions well managed, and applied
 on ivory, will intirely answer the design of the artist.
   By this method you may imitate tortoise-shel, and sevC,
 ral other things, on ivory.
            To stain Ivory of a fine Green,
   TAKE tWO parts of verdigrise an. one part of saI-
 ammoniac; grind them well together, pour strong white-
 wine vinegar on them, and put your ivory in; let it lie
 covered, till the colour has penetrated, and is deep enough
 to your likeing, If you would have it marbled or spotted,
 sprinkle or marble it with wax.