Year: 1899

page_text: I, THOMAS RICHARD SHILLITO, of 15, Tooks Court, London, E.C., Patent Agent, do
hereby declare the nature of this invention-a communication to me from abroad by
Messieurs John Rudolph Geigy & Co., of Basle, Switzerland, Colour Manufacturers-
to be as follows:-
This invention relates to a new dyeing process, especially useful for obtaining
black shades on cotton which are fast to washing and soap. It consists of a treatment
of the cotton fibre dyed with some black substantive dye stuffs with solutions of
formaldehyde.
For instance-10 kilos. of cotton are dyed in the usual manner, in a hot bath,
containing Glauber's salt, with 0.5 kilo. of the black polyazo colour obtained by com-
bination of the tetrazo compound of p-phenylenediamine-azo-ẞ 1 a 4 amidonaphtol
83 sulpho acid first in acid solution with metaphenylenediamine and then in alkaline
solution with resorcine. After washing, the cotton is introduced into a bath con-
taining 0.5 kilo. of a solution of formaldehyde of 40 per cent. to 200 liters of water.
The cotton is worked in this bath for about half an hour, washed, and dried. Through
this simple process great fastness to soap will have been obtained.
Instead of working in a cold and neutral bath, the temperature may be raised up
to boiling and acids or alkalies may be added. The concentration of the formalde-
hyde bath may also be altered.
Instead of the black polyazo dyestuff mentioned in the above example, the analogous
colour containing metatoluylenediamine and some other black substantive dyestuffs
may be used for instance the following :-

page_text: The analogous colouring matters derived from metatoluylenediamine may also be
used.
I, THOMAS RICHARD SHILLITO, of 15, Tooks Court, London, E.C., Patent Agent, do
hereby declare the nature of this invention and in what manner the same is to be per-
formed a communication to me from abroad by Messieurs John Rudolph Geigy
& Co., of Basle, Switzerland, Colour Manufacturers-to be particularly described and
ascertained in and by the following statement :-
This invention relates to a new dyeing process especially useful for obtaining black
shades on cotton which are fast to washing and soap. It consists in a treatment of
the cotton fibre dyed with some black substantive dye stuffs with solutions of
formaldehyde.
For instance: 10 kilos. of cotton are dyed in the usual manner, in a hot bath,
containing Glauber's salt with 0-5 kilo. of the black polyazo colour obtained by combi-
nation of the tetrazo compound of p-phenylenediamine-azo-ẞ1 a 4 amidonaphthol
83 sulpho acid first in acid solution with metaphenylenediamine and then in
alkaline solution with resorcine. After washing, the cotton is introduced into a bath
containing 0.5 kilo. of a solution of formaldehyde of 40 per cent. to 200 liters of
water. The cotton is worked in this bath for about half an hour, washed and dried.
Through this simple process great fastness to soap will have been obtained.
Instead of working in a cold and neutral bath, the temperature may be raised to
boiling and acids or alkalies may be added. The concentration of the formaldehyde
bath may also be altered.
Instead of the black polyazo dye stuff mentioned in the above example, the
analogous colour containing netatoluylenediamine and some other black substantive
dye stuffs may be used, for instance the following:-

page_text: The analogous colouring matters derived from metatoluylenediamine may also be
used.
Having now particularly described and ascertained the nature of said invention and
in what manner the same is to be performed, as communicated to me by my foreign
correspondents, I declare that what I claim is :-
The new dyeing process which consists in a treatment of the cotton dyed
with black substantive dye stuffs with solution of formaldehyde, substantially as
described.
Dated this 7th day of April 1900.
THOMAS R. SHILLITO,
15, Tooks Court, London, E.C.