With Co(NO3)2____
15. Tin, SnO2.—Before the Bp. on Ch. Coats the coal yellow while hot, dirty white when cool. Not reduced.
Before the Bp. on Ch. with Na2CO3. Reduced to metallic tin. White, hard, malleable bead. Coating white and close to assay.
In ignition tube with Na2CO3 and Ch.____
In flame on platinum wire____
With borax bead on platinum wire. In O. F. small quantity dissolves to limpid glass.
With Co(NO3)2. Greenish-blue color.
16. Zinc, ZnO.—Before the Bp. on Ch. Upon ignition becomes yellow. Is not reduced.
Before the Bp. on Ch. with Na2CO3. Reduced to metal. Rapidly volatilized, coating the coal white.
In ignition tube with Na2CO3 and Ch.____