CHARLES L. BRISTOL. 221 
Wotrram—A faint greenish blue; is a permanent 
oxide, Wo, O;. 
‘CoppER— W hite. 
Capmium— White. 
Zinc—W hite ; is very volatile. 
TABLE NO. 3. 
DIFFERENTIATION OF IODIDE COATS. 
Substance. Am HO. Am: 58. 
Disappears slowly 
Pb ae ay to black. 
Sn Disappears at once| whitish yellow. 
Film heated before 
flame, but not 
A touched, changes 
g to bright yellow. 
When touched 
changes to grey. 
As Disappears. to lemon yellow. 
Sb — to orange. 
H to greenish black : 
g excess to black, 
Te Disappears. 
To cherry red—ex- 
Bi cess gives tran- to black. 
sient yellow. 
Disappears. Only 
Zn white coat that 
does. 
ee | | 
Cd to orange. 
105 
