The Production of Blue Colouring Matters.
Year: 1896

page_text: Date of Application, 6th Feb., 1896
Complete Specification Left, 5th Nov., 1896-Accepted, 5th Dec., 1896
The Production of Blue Colouring Matters.
WILLIAM HENRY CLAUS and ALFRED REE Aniline Dye Manufacturers
Droylsden Manchester do hereby declare the nature of this invention to be as
follows:-
By the action of aniline upon gallocyanine, obtained from gallic acid & nitro-
sodimethylaniline hydrochloride, three different products have been prepared:
1. By the action of aniline upon gallocyanine at 150 C. see Berichte der
deutschen Chemischen Gesellschaft volume 21, p. 1741, R. Nietzki and Richard
Otto.
2. By the action of aniline upon gallocyanine at 100 C. see English Patent 1890,
No. 569, Alfred Kern and Edward Sandoz.
3. By the action of aniline upon gallocyanine at ordinary temperature
see Berichte der deutschen Chemischen Gesellschaft volume 25, p. 2997,
line 22 to 29.
The production of sulphoacids (and their salts) of the products mentioned
under 1 and 2 forms the subject matter of Letters Patent 1890 No. 569.
It has now been discovered by us that the aniline addition product of gallo-
cyanine at formed at ordinary temperature yields when sulphonated very useful
bright blue colouring matters which have a great affinity for mordants & may be
used for dyeing wool and for calico printing.
It has been further discovered by us that by dissolving the condensation product
of aniline and gallocyanine produced at ordinary temperature in sulphuric acid and
pouring into water and washing out the excess of acid, the colour is obtained in a
very fine paste which may be usefully employed in calico printing.
We have also found that this same condensation product of aniline and gallo-
cyanine produced at ordinary temperature may be converted into a suitable form
for dyeing by treating the product suspended in water with ammonia and after-
wards with bisulphite of soda, the shades obtained from the colour thus prepared
are much bluer than those produced with gallocyanine.
Dated this 5th day of February 1896.
WILLIAM HENRY CLAUS.
ALFRED REE.
The Production of Blue Colouring Matters.
WILLIAM HENRY CLAUS and ALFRED RÉE both Manufacturing Chemists
Droylsden Manchester 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 :-
By the action of aniline upon gallocyanine obtained from gallic acid and nitro-
sodimethylaniline bydrochloride, three different products have been prepared:

page_text: One hundred pounds of gallocyanine, ten gallons of methylated spirit 61 a.p.
ten gallons of aniline are mixed together and allowed to digest a few days without
any application of heat, twenty gallons of methylated spirit are now added, the
whole mass filter pressed, the cakes of the condensation product again washed with
dilute methylated spirit and dried at ordinary temperature, sulphonated, converted
into a soluble salt and dried as in Example 1.
It has been further discovered by us that by dissolving the condensation products
of aniline and gallocyanine produced at ordinary temperature, in sulphuric acid
and pouring into water and washing out the excess of acid, the colour is obtained
in a very fine paste which may be usefully employed in calico printing.
Ten parts of the condensation product as formed in Examples 1 and 2, are
dissolved in a mixture of 6 parts of sulphuric acid of about 170 T. and one part of
water, poured into water, the colour separates in a fine paste, it is collected in a
filter and washed with water.
We have also found that this same condensation product of aniline and gallo-
cyanine produced at ordinary temperature may be converted into a suitable form
for dyeing, by treating the product suspended in water with ammonia and after-
wards with bisulphite of soda; the shades obtained from the colour thus prepared,
are much bluer than those produced with gallocyanine.

page_text: EXAMPLE.
Twenty parts of the condensation product as formed in Examples 1 and 2 are
mixed with 180 parts of water, then 4 parts of strong ammonia and finally with
3 parts of bisulphite of soda 60 T.
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
The production of blue colouring matters substantially as described.
WILLIAM HENRY CLAUS.
ALFRED RÉE.