EXAMPLES FROM THE WEB FOR FREE BASE
The manner in which the free base was obtained was briefly as follows.
This in acid solution is blue, and the free base is a dark-blue, almost black.
Tetanine may be obtained as a free base by treating the hydrochloride with freshly precipitated moist silver oxide.
In many cases the hydrolysis of a salt is only partial, resulting in the formation of basic salts instead of the free base.