Year: 1888

page_text: Date of Application, 8th Feb., 1888
Specification Accepted, 7th Sept., 1888
We, ADOLPH HERRMANN, MORITZ HERRMANN Dyors & Manufacturers and EUGEN
HERRMANN Dyer all of 76 Kommandantenstrasse Berlin, in the Empire of Germany,
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 a dyeing process by means of which coloured furs or skins
can be manufactured in a considerably shorter time than hitherto.
In carrying out our invention the hairs of the skins to be coloured are first scoured
by means of a solution of calcined soda of 15° (measured cold) which when heated is
placed on the hair side of the skins by means of a brush. After the skins have been
dried they are washed with warm water to remove the superfluous soda after which
the hair is brushed over with a solution of acetic acid (1: 100).
When the skins have been so far prepared they are treated with the required
colour as follows: For example, to dye the skins groy a solution of four grammes of
green vitriol in twenty gramines of water and a solution of four grammes of pyrogallic-
acid in 60 grammes of water are mixed together and then put on the hair side of the
skins by means of a brush. The skins are then left for about twelve hours when they
are brushed over with a solution of pyrolignite of iron (10: 100) left again for about
twelve hours and then washed and dried.
If the hair of the skins thus dyed is required to have white ends a solution of two
grammes of permanganate of potash in 100 grammes of water is laid over the surface
of the hair side of the skins by means of a sponge, the permanganate of potash is then
removed by means of a solution of equal parts of concentrated sulphurous acid and
water (100: 100). When dry these grey skins with white ends are equal to the skins
of silver-grey rabbits.
To manufacture light coloured skins, the skins brushed over with solutions of
calcined soda and of acetic acid as above described are dyed with aniline colours
which are dissoluble in water by brushing the hair side with the colour solution (0,5 to
one gramme of colour to 100 grammos of water) the skins are then left for about from!
five to twenty minutes and then washed and afterwards dried.

page_text: To whiten the ends of the hair of these skins dyed with aniline colours, the hair-side
of the skins is brushed over with a solution of concentrated sulphurous acid and
water (100 100).
To produce dark colours we mix the said aniline colours with a solution of
pyrolignite of iron before brushing the skin with it.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is :-
1. The herein described process for dyeing furs or skins in which the hair side of
the skins is scoured by brushing over with a solution of soda then brushed over with a
solution of acetic acid and then dyed by brushing over with a colour solution, that is
to say, with a heated mixture of solutions of green vitriol and pyro-gallic acid in
water and (after the skins have been loft for about twelve hours) with a solution of
pyrolignite of iron when it is required to produce a grey colour, whilst for other
colours solutions of aniline colours are employed with the addition if required of
pyrolignite of iron substantially as set forth.
2. Whitening the ends of the hair of furs or skins after they have been dyed
according to the process claimed in Claim 1 by lightly laying over the skins by means
of a sponge solutions of permanganate of potash and concentrated sulphurous acid and
by similarly laying over the skins dyed with aniline colours a solution of concentrated
sulphurous acid substantially as set forth.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicants.