An Improved Process for Dyeing Blue.
Year: 1888

page_text: Date of Application, 21st Dec., 1888
Complete Specification Left, 23rd Sept., 1889-Accepted, 21st Dec., 1889
PROVISIONAL SPECIFICATION.
An Improved Process for Dyeing Blue.
A communication to me from abroad by Messrs. STANDAERT BROTHERS, of Hamme,
in the Kingdom of Belgium, Dyers.
I, EDMUND EDWARDS, of the firm of Edwards and Co. Patent Agents and
Engineers of 35 Southampton Buildings, Chancery Lane in the County of Middlesex
do hereby declare the nature of this invention to be as follows:-
This invention has for its object a new or improved blue dye to be used instead of
indigo for dyeing cotton thread or cloth.
Supposing that one hundred kilogrammes of cotton are to be dyed, it is boiled for
about two hours in a bath containing eight kilogrammes of liquid extract of Log-wood
and ten kilogrammes of soda salt, and it is then allowed to remain until the bath
is cold..
It is then taken out and placed in a cold bath containing a solution of ten kilo-
grammes of sulphate of iron, where it is left for about a quarter of an hour and is
removed, rinsed and wrung out.
It is then again placed in the first bath to which has been added two kilogrammes
of the extract of log-wood and three kilogrammes of soda salt which is heated to
from thirty to forty degrees (Centigrade) and in which it is left for about half an
hour. It is again taken out and wrung, and placed in a bath of soap and soda salt,
after which it is immersed in a colouring bath composed as follows:-Five kilo-
grammes of soap, five kilogrammes of salt or sulphate of soda, and one and a half
kilogrammes of colouring material such as aniline blue.
After being left in this bath for about one hour it is removed, rinsed, wrung out,
and dried, when it remains of a permanent blue colour.
Dated thi
1000
EDWARDS & Co.,
35, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Process for Dyeing Blue.
A communication to me from abroad by Messrs. STANDAERT BROTHERS, of Hamme,
in the Kingdom of Belgium, Dyers.
I, EDMUND EDWARDS, of the firm of Edwards and Co. Patent Agents and
Engineers, of 35 Southampton Buildings, Chancery Lane, in the County of Middlesex
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 state-
ment (that is to say):-
This invention has for its object a new or improved process for dyeing blue, to be
used instead of indigo for dyeing cotton thread or cloth.
Supposing that one hundred kilogrammes of cotton are to be dyed, it is boiled for
about two hours in a bath containing eight kilogrammes of liquid extract of logwood
and ten kilogrammes of soda salt, and it is then allowed to remain until the bath
is cold.
It is then taken out and placed in a cold bath containing a solution of ten kilo-
grammes of sulphate of iron, where it is left, for about a quarter of an hour and is
removed, rinsed and wrung out.
It is then again placed in the first bath to which has been added two kilogrammes
of the extract of logwood and three kilogrammes of soda salt, which is heated to from

page_text: thirty to forty degrees (centigrade) and in which it is left for about half an hour. It
is then again taken out and wrung, and placed in a bath of soap and soda salt, after
which it is immersed in a coloring bath compounded as follows:-Five kilogrammes
of soap, five kilogrammes of salt or sulphate of soda, and one and a half kilogrammes
of coloring material such as aniline blue.
After being left in this bath for about one hour it is removed, rinsed, wrung out,
and dried, when it remains a permanent blue colour.
I do not confine myself to the precise ingredients and proportions, which may
be varied according to the character of the material to be dyed and of the tint
required.
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 :-
The improved process for dyeing blue, substantially as set forth.
Dated this Zist day
EDWARDS & Co.,
35, Southampton Buildings, Agents for the Patentee.
EDWARDS & Co.,
35, Southampton Buildings, Agents for the Patentee.