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Updated: May 16, 2025
Just such peculiar quasi-acid, or phenolic substances are Alizarin, and most of the natural adjective dyestuffs, the colouring principles of logwood, cochineal, Persian berries, etc. Hence these substances will be combined and carried down with such precipitated basic salts. The complex compounds thus produced are coloured substances known as lakes.
We have seen that with aluminium sulphate, basic salts are precipitated, i.e. salts with such a predominance of appetite for acids, or such quasi-acids as phenolic substances, that if such bodies were present they would combine with the basic parts of those precipitated salts as soon as the latter were formed, and all would be precipitated together as one complex compound.
In fact, by stronger heating we may drive off all the methyl chloride and get the original Methyl Violet back again. But we have coal-tar colours which are not basic, but rather of the nature of acid, a better term would be phenolic, or of the nature of phenol or carbolic acid. Let us see what phenol or carbolic acid is.
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