Means of Colouring Liquid Weed Destroyers, Sheep Dips, Insect Destroyers, and other Poisonous Liquids.
Year: 1891

page_text: Date of Application, 1st May, 1891
Complete Specification Left, 1st Feb., 1892-Accepted, 19th Mar., 1892
PROVISIONAL SPECIFICATION.
Means of Colouring Liquid Weed Destroyers, Sheep Dips, Insect
Destroyers, and other Poisonous Liquids.
I, THOMAS READE, of the firm of Reade Brothers and Company, of 62 and 63,
Victoria Street, Wolverhampton in the County of Stafford, Manufacturing
Chemists, do hereby declare the nature of this invention to be as follows:-
The main object of this invention is to give a distinctive green colour to liquid
weed destroyers, sheep dips, insect destroyers, and other poisonous liquids, for the
purpose of making it unmistakably apparent that such liquids are not drinks and of
suggesting caution in their use. The invention is useful also, as will be obvious, in
aiding in the prevention of crime.
This colour is produced in such liquids, according to this invention, by the use of
soluble chromium compounds, or other soluble compounds of which chromium
forms a part, amongst which may be mentioned chromate and bi-chromate of
potash and of soda.
The mode of treatment, is to dissolve the chromium compound, or compound of
which chromium forms a part, in the weed destroyer or other poisonous liquid, the
alkali used in such a liquid as the weed destroyer re-acting on the compound and
so changing the liquid to a green colour; and, in the case of a poisonous liquid in
which an alkali is not present, such is introduced specially in order to effect the
necessary re-action with the chromium compound, or compound of which chromium
forms a part, and thus change the liquid to the desired colour.
Dated this Thirtieth day of April 1891.
STEPHEN WATKINS,
Wolverhampton, Agent for the Applicant.
COMPLETE SPECIFICATION.
Means of Colouring Liquid Weed Destroyers, Sheep Dips, Insect
Destroyers, and other Poisonous Liquids.
I, THOMAS READE, of the firm of Reade Brothers and Company, of 62 and 63
Victoria Street, Wolverhampton in the County - of- Stafford, Manufacturing
Chemists, 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 main object of this invention is to give a distinctive green colour to liquid
weed destroyers, sheep dips, and insect destroyers, when such are (as is usually the
case) of an arsenical character, and other arsenical liquids, for the purpose of making
it unmistakably apparent that such preparations are not drinks and of suggesting
caution in their use. The invention is useful also, as will be obvious, in aiding in
the prevention of crime by increasing the chance of detection.
The colour is produced, according to this invention, by the use in such
preparations of soluble chromium compounds, or other soluble compounds of which
chromium forms a part, amongst which may be mentioned chromate and bi-chromate
of potash and of soda.
The mode of treatment is to dissolve the chromium compound, or compound of
which chromium forms a part, in the weed destroyer or other preparation as
aforesaid when such is of an alkaline character; and, in the case of an arsenical
liquid in which an alkali is not present but which is compatible with alkali, such
may be introduced, the presence of an alkali in the liquid being necessary to
render soluble the colouring matter produced.

page_text: The quantity of compound employed for a given volume of liquid to be
coloured will depend, of course, very largely on the amount of chromium in the
compound, and on the depth of colour which it is desired shall be produced.
The following general direction, however, will shew the practical application
of the invention to cases which will ordinarily arise in practice, and the ordinary
experience and judgment of persons having knowledge of the branch of industry
to which the invention relates will readily suggest such variations as may be
required in other cases :-
dissolve from two to four ounces of bi-chromate of potash or soda, according
to the depth of colour required, in one gallon of any arsenical weed destroyer,
cencentrated sheep dipping preparation, insect destroyer, or other arsenical liquid,
when such is of an alkaline character, or, being compatible with an alkali, has
had such a character imparted to it. When the preparations are of an alkaline
character they will usually be sufficiently so to render the colouring matter
produced soluble; but when this is not the case a sufficiency of alkali must be
added for the purpose. From a quarter to half a pint (according to the strength
of the preparation) of saturated solution of oxide of sodium, or equivalent quantity
of other alkali, such as potash, or soda crystals, will usually be sufficient, if
contained in one gallon of the preparation, to ensure the solubility of the
colouring matter.
If chromium is used in other form than as bi-chromate of potash or soda, the
quantity of the compound in which it is contained, which will be required per
gallon of the preparation to be coloured, will of course depend on the character
of the compound.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
The means, substantially as described, of colouring arsenical liquid weed
destroyers, sheep dips, insect destroyers, and other arsenical liquids, that is to say,
by the introduction of a chromium compound, or compound of which chromium
forms a part, to such preparations when of an alkaline character, or, when such
preparations are not alkaline, but are compatible with an alkali, by the introduction
of such compound and of an alkali.
Dated this 30th day of January 1892.
STEPHEN WATKINS,
Wolverhampton, Agent for the Applicant.