The Manufacture and Production of a New Product suitable for Use as a Colouring Matter.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
!
The Manufacture and Production of a New Product suitable for Use
as a 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 been used in the arts except by conversion into
naphthazaring.
My foreign correspondents have discovered that, on reduction, this intermediate
product is converted into a new product which apparently stands to it in the rela-
tion of a leuco-compound, and which can be used directly in dyeing on chrome
mordants. The new product is but slightly soluble in water and can therefore
be readily isolated. The new product can either be used directly in dyeing, or
in the form of its bisulphite compound. The shades obtained are of a greener
cast than those yielded by naphthazarine. They are very fast to light.
The following example will serve to further illustrate the nature of the inven-
tion. The parts are by weight.
Prepare an ordinary naphthazarine melt and pour five hundred parts thereof
(corresponding to fifteen parts naphthazarine) into two thousand five hundred
parts of water. Filter the solution. Next add a solution of forty parts of stannous
chloride in two hundred parts of hydrochloric acid (containing about 32% real
HCI). The deep-blue coloured solution changes first to red, and the mixture
finally becomes almost colourless, whilst the new product separates out in fine
needles which are almost colourless. Filter, wash with water, and either dry,
or, preserve for use in the form of paste.
Instead of taking the naphthazarine melt itself, in the above example, the
isolated intermediate product, say, in the form of its sodium salt, .can be sub-
mitted to the reduction process.
Instead of the hydrochloric acid solution of stannous chloride other reducing
agents can be used.
In the moist state the new product presents the appearance of almost colourless
crystals, when dry the crystals appear bluish it is soluble in sodium carbonate
giving a red-violet solution; its solution in caustic soda-lye is red, which in
contact with the air, becomes blue-violet, a precipitate having a metallic lustre
separating out. It is but slightly soluble in water but on boiling a somewhat

page_text: bluish solution is obtained. Its solution in concentrated sulphuric acid is red,
turning brown on heating.
Doted this 19th day of July 180s.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
The Manufacture and Production of a New Product suitable for Use
as a 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 been used in
the arts except by conversion into naphthazarine.
My foreign correspondents have discovered that, on reduction, this intermediate
product is converted into a new product which apparently stands to it in the rela-
tion of a leuco-compound, and which can be used directly in dyeing on chrome
mordants. The new product is but slightly soluble in water and can therefore
be readily isolated. The new product can either be used directly in dyeing,
in the form of its bisulphite compound. The shades obtained are of a greener
cast than those yielded by naphthazarine. They are very fast to light.
or
The following example will serve to further illustrate the nature of the inven-
tion and also the manner in which it can be performed. The parts are by weight.
Prepare an ordinary naphthazarine melt and pour five hundred parts thereof
(corresponding to fifteen parts of naphthazarine) into two thousand five hundred
parts of water. Filter the solution. Next add a solution of forty parts of stannous
chloride in two hundred and thirty parts of hydrochloric acid (containing about
82% real HCI). The deep blue coloured solution changes first to red, and the
mixture finally becomes almost colourless, whilst the new product separates out
in fine needles which are almost colourless. Filter wash with water and either
dry, or preserve for use in the form of paste.
Instead of taking the naphthazarine melt itself in the above example, the
isolated intermediate product, say, in the form of its sodium salt, can be sub-
mitted to the reduction process.
Instead of the hydrochloric acid solution of stannous chloride other reducing
agents can be used.
In the moist state the new product presents the appearance of almost colourless
crystals, when dry the crystals appear bluish it is soluble in sodium carbonate
giving a red-violet solution: its solution in caustic soda-lye is red, which in
contact with the air, becomes blue-violet, a precipitate having a metallic lustre
separating out. It is but slightly soluble in water but on boiling a somewhat
blueish solution is obtained. Its solution in concentrated sulphuric acid is red,
turning brown on heating.

page_text: 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 product suitable for use as a colouring matter by
submitting the naphthazarine intermediate product to reduction, substantially as
hereinbefore described.
2. Manufacture of a new product suitable for use as a colouring-matter, by
reducing the naphthazarine intermediate product with stannous chloride in the
manner hereinbefore described in the example.
3. As a new article of manufacture the new product suitable for use as a colour-
ing-matter, such as can be obtained substantially as hereinbefore described.
Dated this 4th day of April 1899
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.