Improvement in the Manufacture of Soda Crystals or Washing Soda.
Year: 1894

page_text: Date of Application, 3rd Aug., 1894
Complete Specification Left, 1st June, 1895-Accepted, 6th July, 1895
PROVISIONAL SPECIFICATION.
Improvement in the Manufacture of Soda Crystals or Washing
Soda.
We, CHARLES PRESTON PEAK, JOHN PEAK and HENRY PEAK, all of
Bridgewater Chemical Works, Pemberton, in the County of Lancaster, Manu-
facturing Chemists, and ARTHUR GEOFFREY HADDOCK, of Wellfield House,
Beech Hill, Wigan, in the County of Lancaster, Analytical Chemist do hereby
declare the nature of this invention to be as follows:-
:-
The object of this invention is to manufacture soda crystals, or washing soda
of an improved character for laundry and other purposes, by the addition of
soluble colouring matters to the alkaline liquors from which the crystals are
produced.
According to this invention, there is dissolved in the soda liquor prepared for
crystal making, a sufficient quantity of any suitable soluble colouring agent to
give the required tint and depth of colour desired, and the crystals are then
separated in any ordinary manner.
In practice, we prefer to make the crystals of a blue colour, in order to
neutralize the natural or acquired yellow tinge which linen and other materials
often possess.
Dad thin and do of A nonet 80.1
Improvement in the Manufacture of Soda Crystals or Washing
Soda.
We, CHARLES PRESTON PEAK, JOHN PEAK, and HENRY PEAK, all of
Bridgewater Chemical Works, Pemberton, in the County of Lancaster, Manu-
facturing Chemists, and ARTHUR GEOFFREY HADDOCK, of Langley Green,
Birmingham, in the County of Worcester, Analytical Chemist, formerly of
Wellfield House, Beech Hill, Wigan, in the County of Lancaster, 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:-
The object of this invention is to manufacture soda crystals or washing soda
of an improved character for laundry and other purposes containing a blue or
other colouring matter.
It consists essentially in manufacturing crystals of carbonate of soda of blue or
other desired colour by adding to or dissolving in the soda liquor prepared for
crystal making a quantity sufficient to give the desired tint or depth of colour of
such suitable soluble colouring agent as is best capable of withstanding the action
of the alkali and subsequently separating the crystals in the ordinary manner.

page_text: In practice the invention is primarily intended to make crystals of a blue colour
to neutralise the natural or acquired yellow tinge which linen and other fabrics or
materials often possess.
In carrying out the invention we prepare the alkaline liquors from which the
crystals are produced in the ordinary way and to this liquor when set for
crystalizing after it becomes comparatively cool and before the crystals begin to
form the solution of colouring matter is added to and mixed therein after which
crystalizing proceeds in the ordinary manner the resulting crystals retaining some
of the colouring agents.
In the formation of blue crystals we at present prefer to use methylene blue B.
as hitherto we have obtained the best results therefrom when employed in the
proportion of about one part of the colour to about 4000 parts of the soda liquor.
It is to be understood that other aniline or soluble blues-or other soluble
colours unaffected or not discharged by the soda may be employed either in the
above stated proportions or in other proportions that may be found most desirable
to give the required tint or degree of colour.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what
we claim is―
Washing soda crystals of blue or other colour formed by the addition of a
suitable soluble colouring agent to the alkaline liquor during the process of
manufacturing substantially as described.
Dated this 21st
of Man 1905
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.