Qualitative Tests. 79 
Interfering Elements. 
Iron.—The S. Ph. bead in R. F. is yellow hot, 
brownish-red cold. 
IN THE WET WAY. 
1. NH:OH gives a bulky white precipitate, Ti 
(OH). insoluble in excess. 
"2. Sn or Zn boiled in acid solutions after some 
time give pale-violet or blue solutions, subsequently a 
blue precipitate, which gradually becomes white. 
Confirm.—By blowpipe. 
TUNGSTEN, W. 
WITH THE BLOWPIPE. 
With Borax.—O. F. Flame colorless to yellow hot, 
colorless cold; can be flamed opaque white. 
R. F. Colorless to yellow hot, yellowish brown cold. 
With S. Ph.—O. F. Clear and colorless. 
R. F. Greenish hot, blue cold. On long blowing or 
with tin on coal becomes dark green. 
With Dilute HCl—If insoluble, the substance may 
first be fused with S. Ph. The solution heated with tin 
becomes dark blue; with zine it becomes purple and 
then reddish brown. 
Interfering Elements. 
Iron.—The 8S. Ph. in R. F. is yellow hot, blood-red 
cold. ; 
IN THE WET WAY. 
1. SnCl produces a yellow precipitate on acidify- 
ing with HCl, and applying heat the precipitate ac- 
quires a beautiful blue color. 
2. Heated with HCl and Zn the solution becomes 
purple, and then reddish brown. 
3. KsFeCsNetHCl gives a deep brownish-red 
color; after some time a precipitate of the same color is 
produced. 
