Year: 1888

page_text: I, HENRY HARINGTON LEIGH, Fel. Inst. P.A., Assoc. M. Inst. C.E., practising as
Phillips & Leigh, of No. 22, Southampton Buildings, Chancery Lane, in the County.
of Middlesex, Engineer and Patent Agent, do hereby declare the nature of this
invention to be as follows:-
In my former Specification, No. 5404 of A.D. 1888, I have described a process
for the production of red colouring matter or dyes.
According to my present invention, I obtain a red coloring matter by the action
of one molecule of a salt of tetrazo naphthalene, or tetrazo diphenyl, or tetrazo
stilbene, or tetrazo fluorene, or their homologues, or sulpho or carbo acids, or
substitution products, on, first, one molecule of a di-hydroxy toluene, or its higher
homologues, or the substitution products, or sulpho acids of the same, and then on
another molecule of a different di-hydroxyd, or substitution product, or sulpho acid of
the same.
The following is an example of how I produce, practically, red colouring matters,
which dye unmordanted cotton a bright red in an alkaline bath.
Twenty eight (28) pounds of benzidene are suspended in a fine state of division in
two hundred (200) pounds of water, and twenty five (25) pounds of muriatic acid,
22° Beaumé, are added. The mixture is then cooled with ice, and fourteen (14).
pounds of nitrite of soda, dissolved in five times that weight of water, are then slowly
run in. After the tetrazo compound is fully forined, the solution is run into fourteen
and two-tenths (14.2) pounds of orcin and one hundred (100) pounds of acetate of
soda and ten (10) pounds of caustic soda dissolved in one hundred (100) gallons of
water. After the lapse of about fifteen hours, fifteen and six-tenths (15:6) pounds

page_text: of di-hydroxy xylene dissolved in ten (10) gallons of water are added and the mixture
is left to stand some time, after which the conversion into a soda salt is proceeded
with in the usual manner.
The colouring matter, thus produced, dyes unmordanted cotton red in an alkaline or
soap bath, and the color is fast to soaping.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Colouring Matters.
I, HENRY HARINGTON LEIGH, Fel. Inst. P.A., Assoc. M. Inst. C.E., practising as
Phillips & Leigh of No. 22, Southampton Buildings, Chancery Lane, in the County
of Middlesex, Engineer and Patent Agent, 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 statement :-
In my former Specification No. 5404 of A.D. 1888, I have described a process for
the production of red colouring matter or dyes.
According to my present invention, I obtain a red colouring matter by the action
of one molecule of a salt of tetrazo naphthalene, or tetrazo diphenyl, or tetrazo-
stilbene, or tetrazo-fluorene, or their homologues, or sulpho or carbo-acids, or sub-
stitution products, on, first, one molecule of a di-hydroxy-toluene, or its higher
homologues, or the substitution products, or sulpho-acids of the same, and then on
another molecule of a different di-hydroxyd, or substitution product, or sulpho-acid of
the same.
The following is an example of how I produce, practically, red colouring matters
which dye unmordanted cotton a bright red in an alkaline bath.
28 pounds of benzidene are suspended in a fine state of division in 200 pounds of
water, and 25 pounds of muriatic acid, 22° Beaumé, are added. The mixture is then
cooled with ice, and 14 pounds of nitrite of soda, dissolved 'in five times that weight
of water, are then slowly run in. After the tetrazo compound is fully formed, the
solution is run into 14.2 pounds of orcin and 100 pounds of acetate of soda and
10 pounds of caustic soda dissolved in 100 gallons of water. After the lapse of about
fifteen hours, 15-6 pounds of di-hydroxy xylene, dissolved in 10 gallons of water, are
added, and the mixture is left to stand some time, after which the conversion into a
soda salt is proceeded with in the usual manner.

page_text: The colouring matter thus produced dyes unmordanted cotton red in an alkaline or
soap bath, and the colour is fast to soaping.
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 :-
As new colouring matters, the products which are formed by the action of one
molecule of a salt of the above tetrazo-products on, first, one molecule of a salt of the
above mentioned di-hydroxyds, or a substitution product or sulpho-acid of the same,
and then on a molecule of a different hydroxyd, or a substitution product or sulpho-
acid of the same, substantially as set forth.