Production of Blue Colouring Matter.
Year: 1891

page_text: Date of Application, 11th June, 1891
Complete Specification Left, 11th Mar., 1892-Accepted, 16th Apr., 1892
[Communicated from abroad by THE FARBWERKE VORMALS MEISTER LUCIUS
AND BRUNING, of Hoechst a/ Main, in the Empire of Germany, Chemical
Manufacturers.]
Production of Blue Colouring Matter.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Fellow of the Institute of Patent Agents, do hereby declare
the nature of this invention to be as follows:-
Anthrachrysone, a derivative of anthraquinone, hitherto of no value for industrial
purposes, on being heated with strong, preferably fuming, sulphuric acid, furnishes
easily and in large quantity under proper treatment, a novel colouring matter that
dyes chromo-mordanted wool and cotton blue shades remarkable for resistance to
light and fulling. The process is carried out in the following manner.
1 part by weight of well purified anthrachrysone is slowly introduced into strong
fuming sulphuric acid, so that the temperature never rises above 50° C. The
mixture is well stirred until the solution assumes a blue green colour; the whole
mass is then poured upon ice, afterwards is boiled and the reaction product from its
solution in alkali is precipitated by means of acid.
The colouring matter is in form of a black powder, dissolving in concentrated
sulphuric acid with violet red colour, in ammonia with a blue violet, and in diluted
soda lye with a red brown.
Dated this 11th day of June 1891.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION..
Production of Blue Colouring Matter.
1, Oliver ImraY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Fellow of the Institute of Patent Agents, 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 :—
Anthrachrysone, a derivative of anthraquinone, hitherto of no value for industrial
purposes, on being heated with strong, preferably fuming, sulphuric acid, furnishes
easily and in large quantity under proper treatment, a novel colouring matter that
dyes chromo-mordanted wool and cotton blue shades remarkable for resistance to
light and fulling. The process is carried out in the following manner.
1 part by weight of well purified anthrachrysone is slowly introduced into strong
fuming sulphuric acid, so that the temperature never rises above 50° C. The
mixture is well stirred until the solution assumes a blue green colour; the whole
mass is then poured upon ice, afterwards is boiled and the reaction product from its
solution in alkali is precipitated by means of acid.
The colouring matter is in form of a black powder, dissolving in concentrated
sulphuric acid with a violet red colour, in ammonia with a blue violet, and in diluted
soda lye with a red brown.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed,
claim is.
declare that what I
1-The production of blue colouring matter by subjecting anthrachrysone to the
action of fuming sulphuric acid, substantially as described.
2-The colouring matter produced in the manner above referred to.
ABEL & IMRAY,
Agents for the Applicant.