7. Cobalt, CoO.—Before the Bp. on Ch. In O. F. unchanged. In R. F. is reduced to the metal and is magnetic.
Before the Bp. on Ch. with Na2CO3. Reduced to a gray magnetic mass.
In ignition tube with Na2CO3 and Ch.____
With borax bead on platinum wire. In O. F. colors very intensely blue, both hot and cold.
With Co(NO3)2____
8. Copper, CuO.—Before the Bp. on Ch. Fuses to a black globule, which can be reduced with some difficulty.
Before the Bp. on Ch. with Na2CO3. Readily reduced to metallic bead, which is red in color, hard, malleable.
In ignition tube with Na2CO3 and Ch.____
In flame on platinum wire. Colors flame emerald-green.