The Manufacture and Production of Green Mordant Dyeing Colouring-matters from Halogen Substituted; Flu
Year: 1897

page_text: -Date of Application, 19th June, 1897
Complete Specification Left, 15th Mar:, 1898-Accepted, 14th May., 1898
The Manufacture and Production
of Green Mordant Dyeing
Colouring-matters from Halogen Substituted; Fluoresceines:
I, JAMES ATE JOHNSON; of 47; Lincoln's Inn Fields, in the County of London,
Gentleman, do hereby declare the nature of this invention (which has been com-
municated to me from abroad by the Badische Anilin & Soda Fabrik of
Ludwigshafen on Rhine in the Empire of Germany) to be as follows:-
It is known that-by-heating eosine with concentrated' sulphuric acid' to boiling
traces of a mordant dyeing colouring-matter called brom-coeruleine are obtained!
My foreign correspondents have now discovered that by the addition of boracic
acid to the melt. a great quantity of a useful dyestuff is directly and smoothly.
produced which dyestuff dyes chrom-mordanted wool' fast green shades.
A similar colouring-matter-is-produced on employing-dibrom fluoresceine instead
of eosine (tetrabrom fluoresceine).
The following examples will serve to illustrate the nature of the invention. but
they are merely to be regarded as typical and their details can be varied in many.
respects. The parts are 1
by weight.
Thoroughly mix about ten parts of dibrom-fluoresceine with about ten parts
of-boracic acid; pour it into about one hundred parts of sulphuric acid of 66° Bé.,
stir and heat at two-hundred and forty, to two hundred and fifty, degrees Centi-
grade, until the dibrom-fluoresceine has disappeared:
Cool the melt; pour it into water, filter off the precipitated dyestuff and make
its into a paste. When dried the dyestuff is a violet-black powder: In sodium
carbonate and' in caustic soda.it dissolves with a.bluish green colour; the concen-
trated sulphuric acid solution is brownish-red: The dyestuff is difficultly soluble.
in alcohol with a violet colour. In water it is quite insoluble. It dyes clirom
mordanted wool green shades.
If in the foregoing, example tetrabrom fluoresceine be used in place of the
dibrom-fluoresceine a dyestuff is produced in an analogous manner which dyes
chrom mordanted wool green shades. When dried the dyestuff 'is. a dark violet
powder; the solution thereof in, sodium carbonate is a dirty blue, in caustic soda
adirty bluish-violet; in-concentrated sulphuric acid:(66°¹Bé.) a-cherry-red'and'in
alcohol violet. It is insoluble in water.
Dated this 19th day of June: 1807
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.G.,.
Agents..

page_text: The Manufacture and Production of Green Mordant Dyeing
Colouring Matters from Halogen Substituted Fluoresceines.
I, JAMES YATE JOHNSON, of 47, Lincoln's Inn Fields, in the County of London,
Gentleman, do hereby declare the nature of this invention (which has been com-
municated to me from abroad by the Badische Anilin & Soda Fabrik of
Ludwigshafen-on-Rhine in the Empire of Germany) and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement:-
It is known that by heating eosine with concentrated sulphuric acid to boiling,
traces of a mordant dyeing colouring-matter, called brom-coeruleine, are obtained.
My foreign correspondents have now discovered that by the addition of boracic
acid to the melt a great quantity of a useful dyestuff is directly and smoothly
produced which dyestuff dyes fast green shades on chrome-mordanted wool.
A similar colouring-matter is produced if dibrom-fluoresceine be employed
instead of eosine (tetrabrom-fluoresceine).
The following examples will serve to illustrate the nature of the invention and
the manner in which it can be performed but they are merely to be regarded as
typical and their details can be varied in many respects. The parts are by weight.
Thoroughly mix about ten parts of dibrom-fluoresceine with about ten parts
of boracic acid, pour it into about one hundred parts of sulphuric acid of 66° Bé.,.
stir and heat at two hundred and forty to two hundred and fifty degrees Centi-
grade, until the dibrom-fluoresceine has disappeared.
Cool the melt, pour it into water, filter off the precipitated dyestuff and make
it into a paste. When dried the dyestuff is a violet-black powder. In either
sodium carbonate or caustic soda, it dissolves forming a bluish-green solution.
The concentrated sulphuric acid solution is brownish-red. The dyestuff is diffi-
cultly soluble in alcohol and forms a violet solution. In water it is quite insoluble.
It dyes green shades on chrome-mordanted wool.
.If, in the foregoing example, eosine be used, in place of the dibrom-fluoresceine,
a dyestuff is produced in an analogous manner, which dyes green shades on
chrome-mordanted wool. When dried the dyestuff is a dark violet powder. The
solution thereof in sodium carbonate is a dirty blue, in caustic soda a dirty bluish-
violet, in concentrated sulphuric acid (66° Bé.,) a cherry-red and in alcohol a
violet. It is insoluble in water.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim is :-
1. The production of a green mordant dyeing colouring matter by heating
eosine with concentrated sulphuric acid and in the presence of boracic acid sub-
stantially as hereinbefore described.
2. The production of a green mordant dyeing colouring matter by heating di-
brom-fluoresceine with concentrated sulphuric acid and in the presence of boracic
acid, substantially as herein before described.

page_text: 3. The manufacture of a green mordant-dyeing colouring-matter substantially
in the manners herein before described in the examples.
Dated this 15th day of March 1898
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C.,
Agents.