Qualitative Tests. 65 
Interfering Elements. 
Silver—The iodide melts in KHSOs to a dark-red 
globule, yellow on cooling, and unchanged by sunlight. 
IRON, Fe. 
WITH THE BLOWPIPE. 
On Coal—R. F. Many compounds become mag- 
netic. Soda assists the reaction. 
With Borax.—O. F. Yellow to red hot, colorless to 
yellow cold. (A slight yellow color can only be attrib- 
uted to iron when there is no decided color produced by 
either flame in highly-charged beads of borax.and S. 
Ph.) 
R. F. Bottle-green. With tin on coal, violet-green. 
With S. Ph.—O. F. Yellow to red hot, greenish 
when cooling. Colorless to yellow cold. 
R. F. Red hot and cold, greenish while cooling. 
State of the Iron.—A borax-blue bead from CuO 
is made red by FeO and greenish by Fe:Os. 
Interfering Elements. 
Chromium.—Fuse with nitrate and carbonate of 
soda on platinum, dissolve in water, and test residue 
for iron. 
Cobalt.—By dilution the blue of cobalt in borax 
may often be lost before the yellow of iron. 
Copper.—May be removed from borax bead by fu- 
sion with lead on coal in R. F. 
Manganese.—(a) May be faded from borax bead 
by treatment with tin on coal in R. F.; 
(b) May be faded from 8. Ph. bead by R. F. 
Nickel.—May be faded from borax bead by R. F. 
Tungsten or Titanium.—tThe 8. Ph. bead in R. F. 
will be reddish brown instead of blue or violet. 
Uranwum.—As with chromium. 
