193 
the compou?ids of chromium. 
great heat is evolved, a kind of effervescence is produced, 
and a quantity of green oxide of chromium formed; but the 
oil does not take fire. 
The effects upon pyroxylic spirit are nearly the same as 
upon olive oil. 
The red liquid has scarcely any action upon phosphorus. 
Even when the phosphorus is heated till it is brought into a 
state of fusion no action takes place. If the phosphorus be 
set on fire, the combustion is instantly extinguished by bring¬ 
ing the red liquid in contact with the burning body. 
Neither does it produce any sensible effect upon charcoal 
powder, nor upon indigo. 
When it is poured upon camphor no immediate action takes 
place ; but after two or three minutes the camphor begins to 
swell out, and it gradually occupies many times its former 
bulk. By this action the camphor loses its smell and con¬ 
sistence, and seems as if it had been partially charred, the 
colour being changed into a dark brown. 
The red liquid effervesces rather strongly v/hen dropped 
into naphtha. Much heat is evolved, and the naphtha loses 
its oily nature, but does not catch fire. ' 
Zinc and tin filings effervesce with the red liquid, but the 
action is gentle and soon at an end. On iron filings it does 
not act till we apply heat, when the iron dissolves with effer¬ 
vescence ; but the volatility of the liquid prevents the process 
from going far. On copper and antimony it has no sensible 
action. When brought into contact with mercury, it forms 
with it a matter of the consistence of hog's lard. The mer¬ 
cury loses its fluidity, but retains its colour and metallic 
lustre. 
MDCCCXXVII. C c 
