3. (Douault-Wiéland.)—a. From paste, 2880 parts; oxide of manganese, 72 parts.
b. Topaz-paste that has turned out opaque, 1 part; strass, 8 parts; fuse them together for 30 hours, cool, and again fuse it in small pieces before the blowpipe. Very fine.
4. (Fontanier.) Strass, 16 oz.; precipitate of cassius, peroxide of iron, golden sulphide of antimony, and manganese calcined with nitre, of each 168 gr.; rock crystal, 2 oz., or more.
5. Paste and glass of antimony, of each 8 oz.; rock crystal, 1 oz.; purple of cassius, 11⁄2 dr. Turns on the orange.
Sapphire. 1. From strass, 3600 gr.; oxide of cobalt, 50 gr.; oxide of manganese, 11 gr.
2. (Douault-Wiéland.) Paste, 4608 gr.; oxide of cobalt, 68 gr.; fuse in a little Hessian crucible for 30 hours.
3. (Fontanier.) Paste, 8 oz.; oxide of cobalt, 49 gr.
Topaz. 1. From strass, 1050 gr.; glass of antimony, 44 gr.; purple of cassius, 1 gr.
2. (Douault-Wiéland.) Paste, 3456 gr.; calcined peroxide of iron, 36 gr.
Turquoise. From blue paste, 20 to 24 parts; calcined bones, 1 part.