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Mr. Trevelyan on a peculiar Colouring Matter.
151
and in alcohol, and to paper stained by these solutions, the original colour is restored by nitric, muriatic, sulphuric, tartaric, acetic, and arsenic acids; the three latter of which have no effect on the green colouring matter in the wood, or on its solution in nitric acid or in alcohol; the sulphuric acid gradually decomposes it, becoming of a dark colour.
This paper was accompanied with specimens of the Wood, and of the solution of the colouring matter in nitric acid.
Since writing the above observations, I find the green solution in nitric acid, after keeping for a few months, gradually loses its colour.
W.C.T.
