Synthetic Tannins

Synthetic Tannins

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Synthetic Tannins  by Georg Grasser

Published:

1920

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Synthetic Tannins

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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

Susan Rooke - A Mixture of Fantasy and All Things Heaven and Earth
FEATURED AUTHOR - Susan Rooke is a multiple Pushcart nominee, Best of the Net and Dwarf Stars nominee, and author of the Space Between series. Her poems and short stories have appeared in publications such as The Christian Science Monitor and The Twilight Zone Magazine, among many others. She and her husband live surrounded by cows on a square of green, peaceful country in Central Texas. When she's not writing speculative fiction and poetry, she blogs fortnightly about real life, food and cocktails at SusanRooke… Read more