The Manufacture and Production of New Colouring-matter.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
The Manufacture and Production of New Colouring-matter.
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
communicated to me from abroad by the Badische Anilin & Soda Fabrik, of
Ludwigshafen-on-Rhine, in the German Empire) to be as follows:-
In the manufacture of naphthazarine, or alizarine-black, in a sulphuric acid
melt, an intermediate product is obtained which is easily soluble in water giving
a blue solution. This body has not hitherto been of any use in the arts except
by conversion into naphthazarine.
My foreign correspondents have discovered that on oxydation of this inter-
mediate product, a new colouring-matter can be obtained which dyes on chrome-
mordants giving fast shades of a greener cast than those obtained with
naphthazarine.
The following example will serve to further illustrate the nature of the
invention. The parts are by weight.
Prepare a naphthazarine melt and pour five hundred parts thereof, correspond-
ing to about fifteen parts of naphthazarine, into about two thousand five hundred
parts of water. A. blue solution is obtained. Add to this two hundred parts of a
solution of sodium hypochlorite of six degrees Beaumé. A green body separates
out. Filter and wash free from acid.
The invention is not restricted to the use of the materials, or proportions, given
in the foregoing example, for instance, instead of taking the naphthazarine melt,
the isolated intermediate compound may be taken, say, in the form of its sodium
salt, and instead of the hypochlorite as oxidizing agent, other oxidizing agents
may be used such as potassium bichromate.
The new product can be used in dyeing either as such, or in the form of its
bisulphite compound.
The new colouring-matter, in paste form has a greenish-blue appearance,
it gives a blue-violet solution in sodium carbonate solution, and a blue solution
in caustic soda lye, it is but very slightly soluble in water but, on boiling, gives
a somewhat blue solution, its solution in concentrated sulphuric acid is brown.
Dated this 18th day of July 1898.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C.,
Agents.

page_text: COMPLETE SPECIFICATION.
The Manufacture and Production of New Colouring-matter.
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
communicated to me from abroad by the Badische Anilin & Soda Fabrik, of
Ludwigshafen on Rhine in the German Empire) and in what manner the same is
to be performed to be particularly described and ascertained in and by the
following statement:-
In the manufacture of naphthazarine or alizarine-black, in a sulphuric acid
melt an intermediate product (see Berichte vol. 4 page 439) is obtained, which
is easily soluble in water, giving a blue solution. This body has not hitherto
been of any use in the arts except by conversion into naphthazarine.
My foreign correspondents have discovered that, on oxidation of this inter-
mediate product, a new colouring matter can be obtained which dyes on chrome
mordants giving fast shades of a greener cast than those obtained with
naphthazarine.
The following example will serve to further illustrate the nature of the
invention and also the manner in which it can be performed. The parts are
by weight.
Prepare a naphthazarine melt and pour five hundred parts thereof, correspond-
ing to about fifteen parts of naphthazarine into about two thousand five hundred
parts of water. A blue solution is obtained. Add to this two hundred parts of a
solution of sodium hypochlorite of six degrees Beaumé. A green body separates
out. Filter and wash free from acid.
The invention is not restricted to the use of the materials, or proportions, given
in the foregoing example, for instance, instead of taking the naphthazarine melt,
the isolated intermediate product may be taken, say, in the form of its sodium
salt, and instead of the hypochlorite as oxidizing agent, other oxidizing agents
may be used, such as potassium bichromate.
The new product can be used in dyeing either as such, or in the form of its
bisulphite compound.
The new colouring-matter in paste form has a greenish-blue appearance;
it gives a blue-violet solution in sodium carbonate solution, and a blue solution
in caustic soda lye. It is very slightly soluble in water, but on boiling, gives
a somewhat blue solution, its solution in concentrated sulphuric acid is brown.
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 manufacture of a new colouring-matter by submitting the naphthazarine
intermediate product to oxidation, substantially as hereinbefore described.
2. The manufacture of a new colouring matter by oxidizing the naphthazarine
intermediate product with sodium hypochlorite, substantially in the manner
described in the example.
3. As a new article of manufacture the new colouring matter such as can be
obtained substantially as herein before described.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C.,
Agents.