A NEW BLUE COLOR TO BE USED AS A SUBSTITUTE FOR INDIGO FOR DYEING COTTON, WOOL AND SILK
Year: 1883

page_text: LETTERS PATENT to William Heather Spence of 8 Quality Court Chancery
"s
Lane in the County of Middlesex Patent Agent for an Invention of A NEW
BLUE COLOR TO BE USED AS A SUBSTITUTE FOR INDIGO FOR DYEING COTTON,
WOOL AND SILK Communicated to him from abroad by Auguste François
Chesnais of 128 Rue du renard Rouen in the Republic of France Chemist.
"
PROVISIONAL SPECIFICATION left by the said William Heather Spence at
the Office of the Commissioners of Patents on the 29th March 1883.
WILLIAM HEATHER SPENCE of 8 Quality Court, Chancery Lane in the County
of Middlesex, Patent Agent "A NEW BLUE COLOR TO BE USED AS A SUBSTITUTE
FOR INDIGO FOR DYEING COTTON WOOL AND SILK (a communication to me from
abroad by Auguste François Chesnais of 128 Rue du renard, Rouen, in the Republic
of France, Chemist)
This invention has for its object the production of a new blue color to be used as
a substitute for Indigo for dyeing cotton, wool and silk
For this purpose is effected a new conversion of the induline base in order to
produce with the addition of violet methylaniline and blue of nitrosodimethylaniline
sulpho-conjugated and other derived violets as well as well as methylaniline, iodide
of ethyl and rosaniline and even other blues derived from aniline, methyline,
rosaniline an indestructible blue giving as a result the shade obtained from indigo
and its application in dyeing on the materials mentioned above.
This conversion of the induline base into an acetate a sulphate or a chlorhydrate
or a chlorate takes place by means of the direct action of either of the appropriate
acids to form the compound and the addition or combination of blue of nitrosodi-
methylaniline or of aniline or rosaniline, or a violet of methylaniline iodide of ethyl
or rosaniline.
This mixture applied to the material to be dyed produces a grey blackish shade

page_text: which is converted by means of tannate of tin into a green coloring matter fixed on
the fibre after which it is dyed with the new product.
The manufacture of the blue is carried into effect as follows. In a bath of
paraffine or oil is put the base of induline in contact with C* H3O3 (Acetic acid) or
H2SO (Sulphuric acid) and heated until the mass forms a homogeneous paste, it
is then washed and dried. The mass then presents large broken copper colored
crystals having the appearance of indigo.
This product thus made is insoluble in water.
In order to apply it to the dyeing it is thus converted.
In a litre of ethylic or amylic or methylic alcohol or other alcohol is dissolved
120 grammes of the said base and it is dissolved as required after which is added
nitrosodimethylaniline sulphoconjugated "or" "tlie methylaniline violet indicated
above.
11
When this is done the product is liquid and fit for commerce.
After dyeing the
said product it is oxydised as required: for example by means of the action of 1
2 Cr O³ K (Dichromate of Potash) in a bath for some time.
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page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Heather Spence in the Great Seal Patent Office on the
27th September 1883.
"3
WILLIAM HEATHER SPENCE of 8 Quality Court Chancery Lane in the County
of Middlesex Patent Agent "A NEW BLUE COLOUR TO BE USED AS A SUBSTITUTE
FOR INDIGO FOR DYEING COTTON WOOL AND SILK a Communication to me from
Abroad by Augusto François Chesnais of 128 Rue du renard Rouen in the
Republic of France Chemist
This Invention has for its object the production of a new blue colour to be used
as a substitute for Indigo for dyeing cotton, wool, and silk.
For this purpose is effected a new conversion of the induline base in order to
produce with the addion of Violet Methylaniline and blue of Nitrosodimethylaniline
sulpho-conjugated and other derived violets as well as Methylaniline, Iodide of
Ethyl and Rosaniline and even other blues derived from Aniline, Methyline or
Rosaniline, an indestructible blue giving as a result the shade obtained from Indigo
and its application in dyeing on the materials mentioned above.
This conversion of the induline base into an acetate, a sulphate or a chlorhydrate
or a chlorate takes place by means of the direct action of either of the appropriate
acids to form the compound and the addition or combination of blue of nitrosodi-
methylaniline or of Aniline or Rosaniline or a violet of methylaniline, iodide of
ethyl or rosaniline.
This mixture applied to the materials to be dyed produces a grey blackish shade
which is converted by means of Tannate of Tin into a green colouring matter fixed
on the fibre after which it is dyed with the new product.
The manufacture of the blue is carried into effect as follows:-
In a bath of paraffine or oil is put the base of Induline in contact with C H³ O³
(acetic acid) or H2SO4 (sulphuric acid) and heated until the mass forms a homo-
geneous paste, it is then washed and dried. The mass then presents large broken
copper-coloured crystals having the appearance of Indigo.
This product thus made is insoluble in water.
In order to apply it to the dyeing it is thus converted:
In a litre of Ethylic, Amylic, or Methylic alcohol or other alcohol is dissolved
One hundred and twenty grammes of the said base and it is dissolved as required
after which is added Nitrosodimethylaniline sulpho-conjugated or the methylaniline
violet indicated above..
When this is done the product is liquid and fit for commerce.
After dyeing the said product is oxydised as required for example by means of
the action of 2 Cr 03 K (Dichromate of Potash) in a bath for some time.
Having thus described the nature of the said Invention and in what manner the
same is to be performed communicated to me from abroad as aforesaid I hereby
declare that what I claim as of the said Invention is:
First: The conversion of the Induline base into an Acetate sulphate or
chlorhydrate or a chlorate by the direct action of the acids capable of producing
such compounds and the addition of blue of Nitrosodimethylaniline or other
suitable aniline violet derivatives such as those hereinbefore referred to.
And Secondly: The process of dyeing consisting in the conversion of a blackish
or greyish colour by means of aniline salts (nitrate chlorate and the like) with a
salt of Chromium (2 Cr 0³ K, Cr O³ K, Cr O³ Ba, Cd Cr O³) and the conversion of
this blackish salt into a greenish foam by means of Tannate of Tin on which the
colouring matter is applied after two hours saturation with the dye beginning cold

page_text: and raising the temperature to the boiling point after which the product is
re-oxydised by passing the dyed material through a bath containing a salt of
Chromium such as 2 Cr 03 K, Cr O³ K, or 2 Cr O³ Ba.
In witness whereof I the said William Heather Spence have hereunto set my
hand and seal the twenty seventh day of September in the year of our Lord
One thousand eight hundred and eighty three.
Witness
FRANK REDMAN
8 Quality Court
Chancery Lane
DIENCE. (L.S.)