Synthetic Tannins
Synthetic Tannins
Book Excerpt
ce a pickling
effect, and secondly, the alum at the same time is hydrolysed, and its
dissociation components partly adsorbed by the hide, thereby effecting
true tannage. This double effect is still more pronounced in the
synthetic tannins which contain colloidal bodies of pronounced tanning
intensity on the one hand, inorganic and organic salts on the other,
which then act as described above. Their real mode of action can only
be explained with the aid of experimental data. The following chapters
will deal with the different behaviour of the various groups of
synthetic tannins.
PART I SECTION I
THE SYNTHESIS OF VEGETABLE TANNINS
1. TANNIN
The first investigations of gall-tannin date from the year 1770, at which time, however, no exact differentiation between tannin and gallic acid was made. The first step in this direction was made when Scheele,[Footnote: Grell's _Chem. Ann._, 1787, 3, I.] in 1787, discovered gallic acid in fermented gall extract, and in
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