Year: 1886

page_text: I, AUGUSTE HIPPOLYTE MANGIN of 17 Rue Richard-Lenoir, Paris, in the
Republic of France, Manufacturer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to the treatment of hides and freeing the same from the
hair and its composition is essentially a mixture of caustic soda and of sulph-
hydrate or hydro sulphate of soda.
Without restricting myself to it, I give hereinafter, as an example, the formula
of this product.
Caustic-sodá
50 parts.
Sulph-hydrate or hydro-sulphate 50 parts.
But the caustic soda may be replaced by caustic salt by which I
mean carbonates
of soda which have not been totally transformed into caustic soda mixed together
in variable proportions, and the sulph-hydrate of soda may be replaced by mono-
sulphide of sodium, prepared by the dry process.
These substances, the proportions of which inay vary within very large limits
are dissolved either separately or together. If necessary they are clarified by
decanting or by filtration. The liquid thus obtained may be employed pure in
certain cases, and according to the nature of the hides, it may be mixed with water
in proportions varying from about 2 to 80 per cent and more according to the
nature of the hides to be treated.
The new product I thus obtain is intended to replace the lime and sweating
process in a general manner for the depilation of hides and also for their
preservation.

page_text: COMPLETE SPECIFICATION.
A New Product for Depilating and Preserving Hides.
I, AUGUSTE HIPPOLYTE MANGIN of 17 Rue Richard Lenoir, Paris in the
republic of France, Manufacturer, do hereby declare the nature of this invention
and in what manner. the same is to be performed to be particularly described
and ascertained in and by the following statement:—
This invention relates to the treatment of hides and freeing the same from the
hair, and consists in a liquid the composition of which is essentially a mixture of
caustic soda and of sulph hydrate or hydro-sulphate of soda.
my8c..
"The following is a formula of this product, to which however I do not restrict
50 parts.
Sulph-hydrate or hydro sulphate 50 parts.
Caustic Soda
The caustic soda may however be replaced by other caustic salt, and the proportion
of the mixture may vary. Also the sulph-hydrate of soda may be replaced by
monosulphide of sodium prepared by the dry process.
These substances, the proportion of which may vary within very large limits, are
dissolved either separately or together. If necessary they are clarified by decanting
or by filtration The liquid thus obtained may be employed pure in certain cases,
and according to the nature of the hides it may be mixed with water in proportions
varying from about 2 to 80 per cent or even more according to the nature of the
hides to be treated.
The new product I thus obtain is intended to replace the lime and sweating
process in a general manner for the depilation of hides and also for their
preservation.·
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed. I declare that what
I claim is ;-
For depilating and preserving hides, the combination of caustic soda or other
caustic salt with sulphhydrate of soda or with monosulphide of sodium.