An Improved Method or Process of Fastening the Colours Upon and Within Coloured Leathers.
Year: 1893

page_text: Date of Application, 10th Oct., 1893
Complete Specification Left, 4th July, 1894-Accepted, 4th Aug., 1894
PROVISIONAL SPECIFICATION.
An Improved Method or Process of Fastening the Colours Upon and
Within Coloured Leathers.
We, JOHN THOMAS HARDY of No. 1, Willoughby Street, Lenton, ANDERSON
BROWNSWORD of Chestnut House Mapperley Road, and FREDERICK JAMES
BRADLEY of Arboretum Street, all of Nottingham, Leather Dressers, do hereby
declare the nature of this invention to be as follows :-
Our invention relates to an improved method or process of fastening the colours
upon and within coloured leathers.
The skins when dyed are struck out and dried in the usual manner, the grain is
then well covered with chrome alummed gelatine or glue, that is to say with
gelatine or glue in which chrome alum, or any other of the chromates have been
dissolved.
The gelatine mixture before being applied, must be allowed to set until firm and
the skins when covered must be submitted to a sunlight or other strong light for
about two hours, this treatment makes the gelatine mixture insoluble and being
incorporated with the texture of the skin fastens the colour.
When thoroughly dry the skins are ready for seasoning, and finishing in the usual
manner.
Dated this 9th day of October 1893.
W. SWINDELL,
Agent for the Applicants.
COMPLETE SPECIFICATION.
An Improved Method or Process of Fastening the Colours Upon and
Within Coloured Leathers.
We, JOHN THOMAS HARDY, of 1 Willoughby Street, Lenton, ANDERSON
BROWNSWORD, of Chestnut House, Mapperley Road, and FREDERICK JAMES
BRADLEY, of Arboretum Street, all of Nottingham, Leather Dressers, 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,
reference being had to the accompanying drawings and to the letters and figures
marked thereon, that is to say :-
Our invention relates to an improved method or process of fastening the colours
upon and within coloured leather or skins.
In carrying out our said invention, the skins, when dyed, are struck out and dried
in the usual well known manner, and the grain is then covered with chrome-alumnied
gelatine, or glue, prepared in the following manner :-
Gelatine is soaked in water and afterwards melted by the application of heat.
Chrome alum is then dissolved in hot water separately, and the solution is added to
the dissolved gelatine while hot.
Instead of the gelatine, we may treat isinglass, or glue, in the same manner, and
in place of the chrome alum, we may employ bichromate of potash, or other suitable
chromium compound.

page_text: The ingredients may be used in the following proportions, although mixtures in
other proportions will answer the purpose :-
Gelatine
Chrome alum
-
1 lbs., dissolved in three gallons of water.
lb. dissolved in one pint of water.
The chrome-alummed gelatine, or similar mixture, before being applied to the skins,
or leather, must be allowed to cool and set until firm; and the skins, when covered
therewith, are preferably submitted to sunlight, or other strong light, for about two
hours.
This treatment renders the gelatine mixture insoluble, and being incorporated
with the texture of the skin fastens or fixes the colour. The mixture is, by
preference, applied by means of a brush to the skins. After being laid aside for a
time, or exposed to the light, the said skins become thoroughly dry and are then
ready for seasoning and finishing in the usual manner.
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 improved method or process of fastening or fixing the colours or dyes
upon and within coloured leathers or skins, substantially as herein described.
2. For the purpose of fastening or fixing the colours or dyes upon and within
coloured leathers or skins, the use of a mixture composed of gelatine, or isinglass,
or glue, and chrome alum, or other suitable chromium compound, substantially as
set forth.
3. The herein described mixture consisting of gelatine dissolved in water, and of
chrome alum dissolved in water, substantially in or about the proportions mentioned,
and for the purpose stated.
4. The herein described mixture of glue, chrome alum, and water, substantially
in or about the proportions mentioned, and for the purpose stated.
ERNEST DE PASS,
Chartered Patent Agent,
78, Fleet Street, London, and 6, Victoria Street, Nottingham,
Agent for the Applicants.