The picrate so formed is then decomposed by ammonia.
The picrate, which is easily soluble in benzene, crystallizes in long red needles melting at 222°.
With picric acid it forms a sparingly soluble picrate, which melts at 145 0 C. On the condition of phenanthrene in alcoholic solution see R.
It forms a picrate which melts at 123-124° C.
C0 The picrate melts at 182-183° C.
Silver picrate and methyl iodide yield the methyl ester, which gives with ammonia picramide.
The more important picric powders are melinite, believed to be a mixture of fused picric acid and gun-cotton; lyddite, the British service explosive, and shimose, the Japanese powder, both supposed to be identical with the original melinite; Brugere's powder, a mixture of 54 parts of ammonium picrate and 45 parts of saltpetre; Designolle's powder, composed of potassium picrate, saltpetre and charcoal; and emmensite, invented by Stephen Emmens, of the United States.
The fluorene is separated from this by placing it in a freezing mixture, and is then redistilled or crystallized from glacial acetic acid, or purified by means of its picrate.