Hence, generally, the sources or root substances of the
best and most efficient mordants are the metals of high specific
appetite or valency. I think we have now got a clue to the principle of
mordants and also to the importance of a sound chemical knowledge in
dealing most effectively with them, and I may tell you that the man who
did most to elucidate the theory of mordanting is not a practical man in
the general sense of the term, but a man of the highest scientific
attainments and standing, namely, Professor Liechti, who, with his
colleague Professor Suida, did probably more than any other man to clear
up much that heretofore was cloudy in this region. 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.
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