Leave the cannas in the ground until frost blackens the foliage. |
On heating in a closed tube it decrepitates slightly, blackens and gives off water having an alkaline reaction. |
It blackens in the air, forming a nitride, and decomposes water. |
Ammonium sulphide blackens it, and it is coluble in solution of ammonium acetate, which distinguishes it from barium sulphate. |
After continuing the process for some time, no succinic acid is found in the receiver, but the copal blackens in the retort. |
I procured also from the parish of Pithoea some pencil lead, or lead-like mica which blackens the fingers. |