Publisher's Synopsis
Excerpt from Pharmaceutical Journal and Transactions, 1849-50, Vol. 9
Olume and shape of t e original cakes. Into the composition of the ashes of litmus it is not the object of this paper to enter.
In order to give these cakes a strong blue colour, the Dutch manufacturer introduces into the paste another blue colouring mat ter, namely indigo. Hitherto no one has alluded to the presence of indigo in cake litmus; yet the facts I am about to lay before the Society leave no doubt, in my mind, of its existence in all the specimens of Dutch litmus which I have hitherto examined. F erber, of course, makes no mention of it and I have no doubt that one reason why he was not permitted to inspect the mill was, that he might not discover the fact of the introduction, not merely of the earthy matter to give body to the cake, but also of indigo to give colour.
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