Production of a New Violet Dye or Colouring Matter.
Year: 1889

page_text: Date of Application, 19th Feb., 1889
Complete Specification Left. 1st Oct. 1889-Accepted. 2nd Nov 1889
PROVISIONAL SPECIFICATION.
Production of a New Violet Dye or Colouring Matter.
I, THOMAS RICHARD SHILLITO of 89 Chancery Lane, in the County of Middlesex,
Engineer, do hereby declare, the nature of this invention, a communication to me
from abroad by John Rudolph Geigy & Co. of Basel, Switzerland, Colour Manu-
facturers, to be as follows:-
This invention relates to the production of a violet colouring matter by subjecting
gallamide to the action of the hydrochlorate of nitrosodimethylaniline.
In carrying out the invention I heat, say, 20 kilogrammes of gallamide with
30 kilogrammes of the hydrochlorate of nitrosodimethylaniline in a solution of acetic
acid.
The colouring matter thus formed in a short time separates in small greenish
crystals. It is soluble in water giving violet colour, in acids giving red colour,
and in alkalies giving violet colour. Upon pouring the alkaline solution into water,
the base is precipitated in the form of an amorphous violet powder.
To render this colouring matter applicable to printing purposes, I transform it
into its compound with bisulphate of soda. In dyeing as well as in printing it is
fixed by means of chrome or other suitable mordants.
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T. R. SHILLITO.
COMPLETE SPECIFICATION.
Production of a New Violet Dye or Colouring Matter.
I, THOMAS RICHARD SHILLITO of 89 Chancery Lane in the County of Middlesex,
Engineer, do hereby declare the nature of this invention, a communication to me
from abroad by John Rudolph Geigy & Co. of Basel, Switzerland, Colour Manu-
facturers, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention relates to the production of a violet colouring matter by the action
of the chlorhydrate of nitrosodimethylaniline upon gallamide.
In carrying out the invention we heat-for instance-20 kilogrammes of gallamide
with 30 kilogrammes of the chlorhydrate of nitrosodimethylaniline in a solution of
acetic acid.
The colouring matter thus formed after a short time separates in small greenish
crystals; it is soluble in water with violet colour; in acids with red colour and in
alkalies with violet colour. Upon the alkaline solution being poured into water, the
base precipitates as an amorphous violet powder.
To render this colouring matter applicable to printing purposes it is transformed
into its compound with bisulphite of soda: In dyeing as well as in printing it is
fixed on the fibre by means of chrome or other mordants.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. The production of a violet colouring matter by the action of the chlorhydrate
of nitrosodimethylaniline upon gallamide substantially as described.

page_text: 2. Thé, transformation of the violet colouring matter before referred to into its
compound with bisulphite of soda šubstantially as described.
Dated this 1st day of October 1889
T. R. SHILLITO,
89; Chancery Lane, London, W.C.