The Principles of Leather ManufactureProcter, H. R. (Henry Richardson)
History
The Principles of Leather Manufacture
Procter, H. R. (Henry Richardson)
Leather
Eitner states that he has made chrome-solutions of various types,
containing organic compounds in combination with the chrome-salt, which
combine with the leather, producing a fuller and softer tannage, but he
gives no details as to their preparation, as they are made commercially
by the “Erste Oesterreichische Soda-Fabrik” at Hruschau. The writer has
found that in some cases by the addition of say 3 parts of sugar, or
still better of glucose, to 10 parts of the chrome-alum in making up the
basic liquor, a much fuller and plumper leather is produced, which dries
perfectly soft, even without staking or fat-liquoring; and it is
probable that many other organic compounds may be found which produce
similar effects. The addition of very small quantities of even neutral
tartrates or lactates, and probably of many other organic salts or
acids, have a remarkable effect in lowering the apparent basicity of the
solution, and it is possible that these may also be usefully employed in
combination with very basic liquors. It is highly probable that the
unsatisfactory tanning liquors produced by direct reduction with some
samples of glucose are due to the presence of small quantities of some
organic acid produced during the oxidation. It has been found that these
solutions may be made to tan by the liberal addition of soda. It is
probable that more satisfactory results in chrome-tanning will be
attained by the direct addition of known organic substances to basic
liquors of definite constitution, than by the somewhat uncertain
products of organic oxidations.
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