Collodion Towler, John. The Silver Sunbeam . Second printing, Feb. 1974. It is denominated pyroxyline .
Pyroxyline is soluble also in acetic ether.
This, although the accepted theory, is not satisfactory, because it is found necessary to add water to certain specimens of nitro-sulphuric acid. Another reason for the use of sulphuric acid arises from the fact that pyroxyline is soluble into a gelatinous form in nitric acid, but not in the mixture of nitric and sulphuric acids. Gun-cotton may be precipitated from its ethereal and alcoholic solution into a fibrinous mass like the original, almost. This curious fact exhibits quite an analogy between solutions of salts and the mineral kingdom, and the gelatinous solutions in the organic kingdom. This peculiar fibrinous deposit is thrown down by adding water to the mixed ethereal and alcoholic solution of pyroxyline, because this substance is insoluble in water.