AN IMPROVED PROCESS IN DYEING WITH SUBSTANCES CONTAINING TANNIN OR TANNIO ACID OR GALLOTANNIC ACID
Year: 1884

page_text: We HENRY GRANDAGE Dyer, of 27 Whites Terrace Bradford, in the county of
York, England, and ROBERT ELLIOT STEEL, Master of Arts, Schoolmaster, of
Spring Cliffe House, Heaton Road, Bradford in the County of York, England, do
hereby declare the nature of our invention for AN IMPROVED PROCESS IN DYEING
WITH SUBSTANCES CONTAINING TANNIN OR TANNIO ACID OR GALLOTANNIC ACID
to be as follows:-
Our invention consists in an improved process for dyeing with tannin or tannic
Acid or Gallotannic Acid or other substances of like nature and has for its object
to obtain with a smaller quantity of Tannin matters the same results as are at
present obtained in dyeing.
In order to obtain this result a suitable quantity of certain salts in solution or
otherwise is added to the tannin solution before dyeing. The salts to be employed
are either Borax or Common Salt (Sodium Chloride) or Potassium Chloride or
Salammoniac (Ammonium Chloride) by which means we contend the same results
can be obtained as in dyeing with a larger quantity of Tannin matters.

page_text: We HENRY GRANDAGE dyer of 27 White's Terrace and ROBERT ELLIOT STEEL
Master of Arts Schoolmaster both of Bradford in the County of York do hereby
declare the nature of our invention for AN IMPROVED PROCESS IN DYEING WITH
TANNIN OR TANNIC ACID OR GALLO-TANNIC ACID and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement:-
Our invention consists in an improved process or means of dyeing fibres where
Tannin or Tannic Acid is employed and has for its object to unite with the fibre
a larger quantity of Tannin or Tannic Acid from a given solution than can be
united by processes at present employed.
In order to obtain this result to the solution containing the Tannin obtained in
the usual way from Tannin containing substances such as Myrabolaus Šumae Divi-
divi Galls Gambier etc we add before employing it in dyeing one or more of
certain Sodium Potassium or Ammonium Salts namely Sodium Chloride or
Common Salt Sodium Biborate or Borax Potassium chloride or Ammonium
chloride either in solution or in the solid state in the latter case it may be
necessary to heat the solution in case the solid has not all dissolved.
The quantities of the above mentioned salts we find give the best results are
expressing them in per centages of the Tannin containing substances from which
the solution or extract of Tannin is made of Common Salt ten per cent of Borax
one half per cent of Potassium chloride ten per cent of ammonium chloride two
per cent
When two or more of these salts are added at the same time the
proportions remain the same thus five per cent of Common Salt may be used in
combination with one quarter per cent of Borax or with one per cent of Ammonium
chloride.
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
That by this means the solution of Tannin or Tannic Acid is enabled to deposit
on the fibre more Tannin than can be deposited from the solution by methods at
present in use.
We may observe that we do not claim as original any process for the extraction
of Tannin from Tannin containing substances but what we consider novel and
original is by adding to the tannin containing solution certain salts as hereintofore
mentioned to enable the fibre to take up a larger quantity of tannin.
Dated this fourteenth day of February 1885.