70 Qualitative Tests. 
IN THE WET WAY. | 
Upon heating the acid solution with metallic zine 
it will turn successively blue, green and brown. 
Confirm.—By plowpipe test. 
NICKEL, Ni. 
WITH THE BLOWPIPE. 
On Coal, R. F.—The oxide becomes magnetic. 
With Borax.—O. F. Violet hot, pale reddish brown 
cold. 
R. F. Cloudy, and finally clear and colorless. 
With S .Ph.—O. F. Red hot, yellow cold. 
R. F. Red hot, yellow cold. On coal with tin be- 
comes colorless. 
Interfering Elements. 
General Method.—Saturate two or three borax 
beads with roasted substance, and treat on coal with 
strong R. F. If a visible button results, separate it 
from the borax and treat with S. Ph. in the O. F., re- 
placing the S. Ph. when a color is obtained. If no visi- 
ble button results, add either a small gold button or a 
few grains of test-lead. Continue the reduction, and— 
With Gold.—Treat the gold alloy on coal with S. 
Ph. in strong O. F. 
With Lead.—Scorify button with boracic acid to 
small size, complete the removal of lead by O. F. on 
coal, and treat residual button with S. Ph. in O. F. 
Arsenic.—Roast thoroughly, treat with borax in 
R. F. as long as it shows color, treat residual button 
with 8. Ph..in O. F. 
Alloys.—Roast and melt with frequently changed 
borax in R. F., adding a little lead if infusible. When 
the borax is no longer colored, treat the residual but- 
ton with S. Ph. in O. F. 
