Old lead........... 4 parts

Grain tin.......... 2 parts

Melt in an iron ladle, and pour out in water, then spread on a dish, and calcine in glost oven with plenty of air.

Oxide of Tin

Granulated tin..... 5 pounds

Niter............. 1/2 pound

Put on saucers and fire in glost oven.

Oxide of Chrome is made by mixing powdered bichromate of potash with sulphur as follows:

Potash............ 6 parts

Flowers of sulphur.. 1 part

Put in saggar, inside kiln, so that fumes are carried away, and place 4 or 5 pieces of red-hot iron on the top so as to ignite it. Leave about 12 hours, then pound very fine, and put in saggar again. Calcine in hard place of biscuit oven. Wash this until the water is quite clear, and dry for use.