A Blue Soap for Laundry Washing.
Year: 1889

page_text: Date of Application, 3rd Apr.. 1889
Complete Specification Left, 21st May, 1889-Accepted, 22nd June, 1889
PROVISIONAL SPECIFICATION.
A Blue Soap for Laundry Washing.
I, GREEN ROBERT BISHOP KEMPTON, trading as R. Bishop & Co. of Abbey Road
West Ham, in the county of Essex, Cotton Mill Manager do hereby declare the
nature of this invention to be as follows:-
The object of my invention is to produce a blue soap for laundry purposes, the color
of which is a perfect blue, and is uniform throughout the homogeneous mass of the
soup; and the employment of said blue soap enables the ordinary process of blueing
clothes in order to render them white, to be dispensed with, and the washing and
blueing operations to be confined to one operation.
It has hitherto been a difficult matter to obtain a perfectly blue soap for laundry
purposes, by reason of the action of the alkali contained in the soap upon the blue
coloring matter employed, changing this to a mauve or grey.
37
The
In carrying my invention into effect, I prepare a solution of the ordinary
commercial aniline green, generally known as "concentrated aniline acid green,'
dissolved in strong acetic acid, and mix this with ordinary washing soap of good
quality, at or near to the conclusion of the process of manufacturing the same.
effect of this mixture is to change the color of the solution to a perfect blue color, by
the action of the alkali in the soap upon it, and said soap then is changed to a blue
color, uniformly throughout its mass.
1 may, by the above process, render the soap of any shade of blue, according to the
strength and density of the solution herein before described.
Dated this 2nd day of April 1889.
FREDK. WALKER & HYDE,
4, Little Moorfields, London, E.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
A Blue Soap for Laundry Washing.
1, GREEN ROBERT BISHOP KEMPTON, of Abbey Lodge, Abbey Road, West Ham,
in the county of Essex, Cotton Mill Manager, 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 :—
My Invention consists in the production of a soap for laundry purposes, which is of
a perfectly blue color throughout the homogeneous mass, and has for its objects the
perfect cleansing of the clothes or fabrics washed by its means as well as enabling
ordinary blues to be dispensed with, since a perfectly white appearance is obtained
by the employment of the blue soap according to my invention.
It has hitherto been the custom to soak the clothes or other fabric after being
washed in a solution of some solvent blue, thus neutralizing the slightly yellow tint
acquired during the process of washing, and rendering said clothes or fabrics perfectly
white. Therefore a distinct advantage is gained by the employment of the blue soap
forming the subject of this invention, since the clothes or the like may be washed
clean, and finished white at one operation, simply needing rinsing in clean water
before drying.
Hitherto a perfectly blue laundry soap, in which the coloring matter is equally
distributed and mingled with the mass, has not been produced, on account of the
action of the alkali contained in the soap upon the blue colors usually employed,
and causing these to assume a grey appearance, or to be of a mauve color when the
mass has become solidified.

page_text: 66
In carrying my invention into effect, I employ a solution of what is generally
known as concentrated aniline green," with any suitable blue, the former being
prepared with acetic acid. Said compound solution is intimately mixed with the soap
when the latter is in the final stage of its manufacture, and I find that I am enabled
by this method to neutralize the action of the alkali before mentioned, and cause the
mass of soap to be of a perfect blue color throughout.
I do not confine myself to any particular shade of blue, but may vary the degrees.
of lightness or darkness by increasing or diminishing the quantity of the compound.
solution hereinbefore described, relatively to the quantity of soap.
Having now particularly described, and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed 1 declare that what I
claim is,
The composition and preparation of a blue soap substantially as and for the purposes
herein described and set forth.
1 day
FREDK. WALKER & HYDE,
4, Little Moorfields, London, E.C., Agents for the Applicant.