Improved Mordant for Black Dyeing.
Year: 1890

page_text: Date of Application, 24th July, 1890
Complete Specification Left, 29th Aug., 1890-Accepted, 11th Oct.. 1890
PROVISIONAL SPECIFICATION.
Improved Mordant for Black Dyeing.
WILLIAM MARRIOTT 88 Halifax Old Road Huddersfield in the County of York
Manufacturing Chemist, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an improved method of so treating copperas (sulphate of
protsoxide of iron) and blue stone (sulphate of copper) as first to neutralize the
sulphuric acid contained in these two metallic salts and then combine with the oxides
of iron and copper oxalic acid in such proportion as to give a nutral combination of
oxalate of iron and copper of a uniform composition.
This when dry is ground to a fine powder forming the mordant.
The mordant is used along with logwood or other dye woods in dyeing wool wollens
or worsteds.
.
In dyeing peice goods the mordant and dye woods required can be added to the dye
vat for each lot of peices without emptying the same effecting a saving in fuel dyewoods
and labour.
Dated this 02-11
Dated this 22-d day of July 1890.
COMPLETE SPECIFICATION.
Improved Mordant for Black Dyeing.
WILLIAM MARRIOTT of Huddersfield in the County of York Manufacturing
Chemist 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 an improved method or process in producing a mordant for
black dyeing. I take
276 lbs. of copperas
125 lbs.
blue stone
402 lbs. soda crystallized.
These I place in an iron pan and gently heat until they dissolve in their water of
crystallization and becomes a semmi fluid mass. During the heating the carbonic acid
previously combined with the soda escapes and the soda neutralizing the sulphuric
acid liberates the oxides of iron and copper.
When the mass becomes quiescent from the expulsion of the carbonic acid I add
whilst in the fluid state 189 lbs. of oxalic acid.
The oxalic acid so added unites with the oxides of iron and copper forming oxalates
of the same.
After thorough incorporation the colour previously dark brown changes to a pale
yellow.
This mixture is then placed on iron boxes heated by steam and constantly stirred
untill dry. It is then ground into a fine powder and is ready for use.
These proportions are the equivalents neccessary for a neutral combination of oxalic
acid with the oxides of iron and copper but in practice I find it advisable to add a
further 30 lbs. of oxalic acid so as to give a slight acid reaction as this facilitates the
solubility of the colouring matter of the logwood with which this mordant is used in
dyeing black.
1 do not confine myself to the above propertions of copperas or blue stone but
whatever quantity of each is used it is essential that the proportion of soda added be
such as to neutralize the sulphuric acid and the proportion of oxalic acid be such as to
combine with the two mettalic oxides forming oxalates of iron and copper.
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page_text: This mordant is used along with logwood in the dye bath in dyeing a fast black on
wool wollens worsteds and yarns.
The quantity of mordant required varies from 7 to 12 per cent. of the weight of the
wool or peices opperated upon dependent on the shade desired and the weight of dye
woods used.
The neutral properties of this mordant allows it to be used continuously in the dye
bath along with the dye woods without emtying or wasting the dye liquid thus saving
dyewoods fuel and time.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
First. The neutralizing of the sulphuric acid in the copperas or blue stone by using
the equivalent quantity of soda for that purpose.
Second. Combining with the oxides of iron or copper so produced the equivalent
quantity of oxalic acid for that purpose.
Third. Producing the mordant as a dry powder in the manner here above discribed.
Dated this 28th dev Ananst 1890
WILLIAM MARRIOTT.