1416. Bone and Ivory: Blue

  1. Immerse for some time in a dilute solution of sulphate of indigo—partly saturated with potash—and it will be fully stained.
  1. Steep in a strong solution of sulphate of copper.

1417. Bone and Ivory: Green

  1. Dip blue-stained articles for a short time in nitro-hydrochlorate of tin, and then in a hot decoction of fustic.
  1. Boil in a solution of verdigris in vinegar until the desired colour is obtained.

1418. Bone and Ivory: Red