IMPROVEMENTS IN THE PRODUCTION OF COLOURING MATTERS SUITABLE FOR DYEING AND PRINTING
Year: 1881

page_text: LETTERS PATENT to Joseph Anthony Dixon, of 175, West George Street,
Glasgow, in the County of Lanark, North Britain, Solicitor, for an Invention
of "IMPROVEMENTS IN THE PRODUCTION OF COLOURING MATTERS SUITABLE
FOR DYEING AND PRINTING." A communication from abroad by Carl Rumpff,
PROVISIONAL SPECIFICATION left by the said Joseph Anthony Dixon at the
Office of the Commissioners of Patents on the 10th May 1881.
JOSEPH ANTHONY DIXON, of 175, West George Street, Glasgow, in the County
of Lanark, North Britain, Solicitor. "IMPROVEMENTS IN THE PRODUCTION OF
COLOURING MATTERS SUITABLE FOR DYEING AND PRINTING." [A communication
from abroad by Carl Rumpff, of Elberfeld, in the Empire of Germany, Chemical
Manufacturer.]
The nature and object of this Invention is to extend the application of the new
mono-sulpho-acid of beta napthol, described in the Provisional Specification left
by me at the Office of the Commissioners of Patents on the Twenty first day of
March, A.D. 1881, and numbered 1225, and therein designated the alpha-mono-
sulpho acid of beta napthol (and hereinafter referred to as my new acid), in the
preparation of colouring matters of various shades suitable for dyeing and printing,
by causing the said mono-sulpho-acid of beta napthol, or its sodium, or other
equivalent salts, or the further substitution compounds thereof, with the nitro
amido halogen, hydroxyl, or carboxyl groups to react on or be reacted on by the
respective different bodies or substances hereinafter described, in manner herein-
after described or referred to, or in manner substantially similar.
First. In my said Provisional Specification I have by inadvertence so expressed
myself as to omit therefrom the production of colouring matters by the action of
my said new acid on the sulpho acids of diazo azo benzol and its homologues other
than the mono-sulpho-acids thereof, and also the production of colouring matters
by the action of my said new acid on the sulpho acids of diazo benzol and its
homologues, and on the sulpho acids of the diazo napthalenes, and have especially.
mentioned only the sulpho acids of the diazo compounds derived from the other
Dies 21

page_text: members of the benzol series, not homologues, with benzol, as diazo-ethyl-xylol
and the like. I now, in order to rectify my said omissions, specify as part of this
Invention the production of colouring matters by acting with my said new acid on
the diazo derivatives of the sulpho acids of amido-azo-benzol and its homologues
which are substituted more than once by the sulpho group, as also the production
of colouring matters by acting with my said new acid on the sulpho substitution
compounds (whether once or oftener so substituted) of diazo benzol and its.
homologues, and on the sulpho substitution compounds (whether once or oftener so
substituted) of the diazo napthalenes. The procedure for producing colouring
matters by the reaction of my said new acid on the said sulphonated diazo
derivatives of amido-azo-benzol and its homologues is substantially the same as
that described in my Specification filed in pursuance of a proviso in the Letters
Patent granted to me as of the Sixth day of December, A.D. 1879, No. 5003, for
producing the diazo-azo colouring matters therein referred to. The mode of
combining the diazo-sulpho-benzoles and napthalenes with such a body as my new
acid is also well known to chemists. Thus, for example, I take any of the sulpho
acids of napthylamine, convert it by the action of nitrous acid (or a suitable nitrito
and acid to liberate nitrous acid therefrom) into the corresponding diazo compound,
and bring this diazo compound into reaction, molecule for molecule, with my new
acid, the cold dilute solution of the latter being gradually introduced into the
solution of the diazo compound till there is no further precipitation or formation
of colouring matter. The liquors are preferably kept alkaline till the end of the
operation, when they are slightly acidulated, and the sulpho-oxy-azo-napthalene
produced (after precipitation by common salt if necessary) is separated by
filtration.
Second. I also prepare colouring matters by means of my new acid as follows:-
I take a diazo compound derived from any of the bodies known to chemists as
nitro phenols, or from the substitution compounds thereof, with one or more of the
following groups, viz., the halogens or the nitro sulpho hydroxyl or carboxyl
groups (such as diazo phenol, diazo-nitro phenol, diazo-nitro-chlor-brom or iod-
phenol, diazo-sulpho-phenol, diazo-sulpho-kresol,, diazo-salicylic acid, diazo-sulpho-
salicylic acid, and the like), and I bring the same in solution into combination,
molecule for molecule, with a solution of my said new acid or its further
substitution compounds aforesaid. The reaction should preferably be conducted
at the ordinary temperature, and the combining solutions should preferably be
maintained in an alkaline condition until the termination of the reaction. The
mixture or combination of the two substances brought together is allowed to
remain until no further formation of the resulting colouring matter takes place,
after which the colouring matter formed may be obtained by, the addition of any
suitable acid, as, for example, muriatic acid, and separated by filtration or otherwise,
and purified and prepared for the market, all' in manner now well understood with
regard to the preparation of analogous dyestuffs formed by combination of a diazo
phenolic body with a sulphonated phenol.
Third. I also prepare colouring matters by the action of my said new acid upon
the diazo compounds of the phenolic or naptholic ethers instead of the diazo
compounds of the phenoles themselves. For this purpose I take the diazo
derivative of any of the phenolic or naptholic ethers (that is to say, the methylic,
ethylic, amylic, benzylic, and other similar ethers of the phenoles of the benzolic
series, whether homologues with carbolic acid or not, and of the naptholes in which
the hydrogen of the phenolic or naptholic hydroxyl is replaced by methyl, ethyl;
amyl, benzyl, or other like alkyl or radicle of the fatty or aromatic series), or of
the sulpho acids thereof, or of their hologen nitro hydroxyl or carboxyl substitution
compounds, and I combine the same (as before explained in the case where
the diazo drivatives of the nitro phenoles) with my said new acid as the phenolic
or naptholic member of the combination, and after the colouring matter has formed
separate and purify it by well known means. In the case of the carboxylized diazo
phenoles and diazo phenolic ethers hereinbefore mentioned, it is immaterial to the
use

page_text: process (though not as to shade) whether the carboxyl group is also etherified as
aforesaid or not.
Fourth. Further, I prepare colouring matters by acting, molecule for molecule,
with my new acid, or the further substituted compounds thereof aforesaid, as the
phenolic or naptholic element or member of the combination, on the diazo
derivatives of the aromatic acids and on the diazo derivatives of the ethers thereof,
in which the hydrogen of the carboxyl group of the parent aromatic acid is
substituted or replaced by methyl, ethyl, benzyl, or other like alkyl or radicle of
the fatty or aromatic series, and that whether the carboxyl group or groups of the
said aromatic acid be directly attached to the benzolic or napthalenic nucleus or be
attached to a prolonged slide chain connected with the nucleus, and also whether
the basicity and atomicity of the said aromatic acids are equal or unequal, and
whether the diazo compounds of the said aromatic acids and ethers are further
substituted with the sulpho-nitro halogen hydroxyl or carboxyl groups or not, and
also whether, in the case of the ethers of the oxyacids of the said aromatic series,
the phenolic or naptholic hydrogen is also replaced with methyl or other like
radicle, as aforesaid, or not. Thus, for example, I may use either the diazo
compounds of benzoic acid, cinnamic acid, alpha and beta napthoic acid, or of
salicylic acid and alpha and beta oxynapthoic acid, and I may either use the
diazo compound of such an ether, as the so called salicylic-acid-methyl-ether
OH
C₁ H₁
or of such an ether as the so-called ethyl-salicylic-acid-
CO OCH
methyl-ether C, H₁
OC₂ H5
CO OCH,'
OC₂ H
CO OH
or of such an ether as the ethylic ether of
benzoic acid C, H, CO OC, H. I explain that under the immediately preceding
head of this Specification, in which I speak of the action of my new acid on diazo
phenolic or naptholic ethers, I may also use the diazo compound of such an ether
as the so called ethyl-salicylic acid C, H,
to react on my said new
acid. The modes of preparing the different ethers hereinbefore mentioned are well
known, and the mode of reacting with the diazo compounds of said aromatic acids
or their carboxylic ethers before mentioned on such a body as my new acid is also
well known. The amido group of the amido compounds of the aromatic acid
employed (say, for example, para-amido-benzoic acid, para-amido-cinnamic acid, or
the amido compounds of either of the napthoic acids) or the corresponding ethers
(in the form of the hydro-chlorates and in aqueous solution) is by the action of
nitrous acid reduced to the diazo form, and the diazo compound so obtained is then
added, molecule for molecule, to an alkaline solution of my new acid (in the form of
its sodium or other equivalent salt), and the colouring matter which is formed is
separated and purified in the ordinary and well known way.
Fifth. Further, I produce diazo-azo colouring matters analogous to those men-
tioned in the Specification of my aforesaid Patent, No. 5003, A.D. 1879, by acting
first with any of the diazo derivatives of the aromatic acids, or of their carboxylic
ethers hereinbefore mentioned, whether substituted as aforesaid or not, on an excess.
of the amido compound of any hydro carbon of the aromatic series (further
substituted as aforesaid or not), or on an excess of an amido compound of any
carboxylic or phenolic ether of such hydro-carbon (substituted as aforesaid or not),
so as to produce, in manner well known to chemists, an amido azo compound or
combination, and then I diazotise the amido group of the amido azo compound so
produced, and combine the diazo-azo-body thus obtained with my said new acid,
so as to produce a diazo-azo-colouring matter of the following or similar type,
viz.:-

page_text: immediately preceding typical formula, I may, by altering the materials with which
I work in a way which will be perfectly obvious to any chemist, have the diazo
derivative of any aromatic carboxyl ether (substituted as aforesaid or not), or a
diazo derivative of an aromatic hydrocarbon (substituted as aforesaid or not), or
of any phenolic or naptholic ether thereof (substituted as aforesaid or not); and in
the second member I may have (whichever of the possible alternatives just
mentioned I have used to form the first member) the diazo derivative (that is to
say, in the first instance the amido derivative, which I then convert into the
corresponding diazo derivative) of either such aromatic acid (substituted as
aforesaid or not), or of its carboxylic ether, or of an aromatic hydrocarbon
(substituted as aforesaid or not), or of any phenolic or naptholic ether derived
from such hydrocarbon, provided that in all cases the third or final member of the
combination consists of my said new acid or any of the substitution compounds
thereof hereinbefore mentioned.
In the cases of colouring matters produced by the combinations described under
the preceding heads, fourth and fifth of this Specification, I may, if requisite or
desirable, sulphonate the product.
=
Sixth. Further, I produce colouring matters analogous to those mentioned in my
said Specification, No. 5003, A.D. 1879, by acting with my said new acid in manner
therein described on the diazo derivatives of the mixed amido azo compounds of
the type hereinafter described, and the sulpho acids thereof, instead of the diazo
derivatives of amido-azo-benzol or its homologues, or the mono-sulpho acids thereof, as
mentioned 'in my said Provisional Specification, or their higher sulpho acids, as herein-
before mentioned. The mixed amido-azo-compounds here referred to are such as the
compounds which may be denominated azo benzol-ortho-amido-toluol (C, E, N
NC, H, NH2), ortho-azo-toluol-amido-benzol (C, H, N = N - C₁ H, NH²), azo-
benzol-meta-amido-xylol (C, H, N = N - C, H, NH²), ortho-azo-toluol-meta-amido-
xylol (C, H, N N - C, H, NH²), para-azo-toluol-meta-amido-xylol (C, H, N =
NC, H, NH2), meta-azo-xylol-amido-benzol (C, H, N = NC, H, NH²), meta-
azo-xylol-ortho-amido-toluol (C, H, N = N - C, H, NH), azo-benzol-amido-naptha-
lene (C, H, N = N — C, H, NH³); or I may, instead of these mixed amido-azo-
compounds, use the sulpho acids thereof, whether the sulpho group or groups be in
the first or second member, or whether the said group or groups be in the said
members before combination or be introduced by sulphonization at any subsequent
stage. I may also have in the azo and the amido members of such a mixed amido
azo combination the diazotised and amido derivatives respectively of aromatic
hydrocarbons which are not homologues with benzol, the same being sulphonated
or not as aforesaid,
Seventh. I also prepare colouring matters by introducing one molecule of my
said new acid dissolved in glacial acetic acid at a temperature of about 110° to
115° centigrade gradually into a solution of nitroso dimethylanilin hydrochlorate,
washing the "schmelze or melt obtained with water, then dissolving it in hot
alcohol and adding muriatic acid, whereupon the colouring matter precipitates or
. crystallizes out on cooling. The composition of this colouring matter I believo to
N (CH³).
TT
ATL

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Joseph Anthony Dixon in the Great Seal Patent Office on the
10th September 1881.
JOSEPH ANTHONY DIXON, of 175, West George Street, Glasgow, in the County
of Lanark, North Britain, Solicitor. "IMPROVEMENTS IN THE PRODUCTION OF
COLOURING MATTERS SUITABLE FOR DYEING AND PRINTING." A communication
from abroad by Carl Rumpff, of Elberfeld, in the Empire of Germany, Chemical
Manufacturer.
The nature and object of this Invention is to extend the application of the new
mono-sulpho-acid of beta-napthiol described in the Provisional Specification left by
me at the office of the Commissioners of Patents on the Twenty first day of March,
A.D. 1881, and numbered 1225, and therein designated the alpha-mono-sulpho-acid
of beta-napthol (and hereinafter referred to as my new acid), in the preparation
of colouring matters of various shades suitable for dyeing and printing, by causing
the said mono-sulpho-acid of beta-napthol, or its sodium, or other equivalent salts,
or the further substitution compounds thereof, with the nitro-amido-halogen
hydroxyl or carboxyl groups to react on or be reacted on by the respective different
bodies or substances hereinafter described, in manner hereinafter described or
referred to, or in manner substantially similar.
First. In my said Provisional Specification I have by inadvertence so expressed
myself as to omit therefrom the production of colouring matters by the action of
my said new acid on the sulpho-acids of diazo azo benzol and its homologues other
than the mono-sulpho-acids thereof, and also the production of colouring matters
by the action of my said new acid on the sulpho acids of diazo benzol and its
homologues, and on the sulpho acids of the diazo napthalenes, and have especially
mentioned only the sulphio acids of the diazo compounds derived from the other
members of the benzol series, not homologues, with benzol; as diazo-ethyl-zylol and
the like. I now, in order to rectify my said omissions, specify as part of this
Invention the production of colouring matters by acting with my said new acid
on the diazo derivatives of those sulpho acids of amido azo benzol and its homologues
which are substituted more than once by the sulpho group; as also the production
of colouring matters by acting with my said new acid on the sulpho substitution
compounds (whether once or oftener so substituted) of diazo benzol and its
homologues, and on the sulpho substitution compounds (whether once or oftener
so substituted) of the diazo napthalenes. The procedure for producing colouring
matters by the reaction of my said new acid on the said sulphonated diazo
derivatives of amido-azo-benzol and its homologues is substantially the same as
that described in my Specification filed in pursuance of a proviso in the Letters
Patent granted to me as of the Sixth day of December, A.D. 1879, No. 5003, for
producing the diazo colouring matters therein referred to. The mode of combining
the diazo-sulpho-benzoles and napthalenes with such a body as my new acid is
also well known to chemists. Thus, for example, I take any of the sulpho-acids of
napthylamine, convert it by the action of nitrous acid (or a suitable nitrite and
acid to liberate nitrous acid therefrom) into the corresponding diazo compound,
and bring this diazo compound into reaction, molecule for molecule, with my new
acid, the cold dilute solution of the latter being gradually introduced into the
solution of the diazo compound till there is no further precipitation or formation
of colouring matter. The liquors are preferably kept alkaline till the end of the
operation, when they are slightly acidulated, and the sulpho-oxy-azo-napthalene
produced (after precipitation by common salt if necessary) is separated by
filtration.

page_text: Second. I also prepare colouring matters by means of my new acid as follows:-
I take a diazo compound derived from any of the bodies known to chemists as
nitro phenols, or from the substitution compounds thereof, with one or more of the
following groups, viz., the halogens or the nitro sulpho hydroxyl or carboxyl
groups [such as diazo phenol, diazo-nitro-phenol, diazo-nitro-chlor- (brom- or iod-,)
phenol, diazo-sulpho-phenol, diazo-sulpho-kresol, diazo-salicylic acid, diazo-sulpho-
salicylic acid, and the like], and I bring the same in solution into combination,
molecule for molecule, with a solution of my said new acid or its further substitution
compounds aforesaid. The reaction should preferably be conducted at the ordinary
temperature, and the combining solutions should preferably be maintained in an
alkaline condition until the termination of the reaction. The mixture or combi-
nation of the two substances brought together is allowed to remain until no further
formation of the resulting colouring matter takes place, after which the colouring
matter formed may be obtained by the addition of any suitable acid, as, for example,
muriatic acid, and separated by filtration or otherwise, and purified and prepared
for the market, all in manner now well understood with regard to the preparation
of analogous dyestuffs formed by combination of a diazo phenolic body with a
sulphonated phenol.
Third. I also prepare colouring matters by the action of my said new acid upon
the diazo compounds of the phenolic or naptholic ethers instead of the diazo com-
pounds of the phenoles themselves. For this purpose I take the diazo derivative
of any of the phenolic or naptholic ethers (that is to say, the methylic, ethylic,
amylic, benzylic, and other similar ethers of the phenoles of the benzolic series,
whether homologues with carbolic acid or not, and of the naptholes in which the
hydrogen of the phenolic or naptholic bydroxyl is replaced by methyl, ethyl, amyl,
benzyl, or other like alkyl or radicle of the fatty or aromatic series), or of the sulpho
acids thereof, or of their halogen nitro hydroxyl or carboxyl substitution com-
pounds, and I combine the same (as before explained in the case where I use the
diazo derivatives of the nitro phenoles) with my said new acid as the phenolic or
naptholic member of the combination, and after the colouring matter has been
formed, separate and purify it by well known means. In the case of the car-
boxylized diazo phenoles and diazo phenolic ethers hercinbefore mentioned it is
immaterial to the process (though not as to shade) whether the carboxyl group is
also etherified as aforesaid or not.
Fourth. Further, I prepare colouring matters by acting, molecule for molecule,
with my new acid, or the further substituted compounds thereof aforesaid, as the
phenolic or naptholic element or member of the combination, on the diazo
derivatives of the aromatic acids, and on the diazo derivatives of the ethers thereof,
in which the hydrogen of the carboxyl group of the parent aromatic acid is
substituted or replaced by methyl, ethyl, benzyl, or other like alkyl or radicle of
the fatty or aromatic series, and that whether the carboxyl group or groups of the
said aromatic acid be directly attached to the benzolic or napthalenic neucleus, or
be attached to a prolonged side chain connected with the nucleus, and also whether
the basicity and atomicity of the said aromatic acids are equal or unequal, and
whether the diazo compounds of the said aromatic acids and ethers are further
substituted with the sulpho-nitro-halogen hydroxyl or carboxyl groups or not, and
also whether, in the case of the ethers of the oxyacids of the said aromatic series,
the phenolic or naptholic hydrogen is also replaced with methyl or other like
radicle, as aforesaid, or not. Thus, for example, I may use either the diazo
compounds of benzoic acid, cinnamic acid, alpha and beta napthoic acid, or
of salicylic acid, and alpha and beta-oxynapthoic acid, and I
may either
use the diazo compound of such an ether, as the so called salicylic-acid-methyl-
cther (C, H.
acid-methyl-ether (C. H.
OH
CO OCH,) or of such an ether as the so called ethyl-salicylic-
OC
H
CO OCH,
or of such an ether as the ethylic ether
1
1 1

page_text: preceding head of this Specification, in which I speak of the action of my new acid
on diazo-phenolic or naptholic ethers, I may also use the diazo compound of such an
ether as the so called ethyl-salicylic-acid C, H,
OC₂ H
to react on my said
CO OH
new acid. The modes of preparing the different ethers hereinbefore mentioned are
well known, and the mode of reacting with the diazo compounds of the said aromatic
acids, or their carboxylic ethers before mentioned, on such a body as my new acid
is also well known. The amido group of the amido compounds of the aromatic
acid employed (say, for example, para-amido-benzoic-acid, para-amido-cinnamic
acid, or the amido compounds of either of the napthoic acids) or the corresponding
ethers (in the form of the hydro-chlorates and in aqueous solution) is by the action
of nitrous acid reduced to the diazo form, and the diazo compound so obtained is
then added, molecule for molecule, to an alkaline solution of my new acid (in the
form of its sodium or other equivalent salt), and the colouring matter which is
formed is separated and purified in the ordinary and well known way.
Fifth. Further, I produce diazo-azo or tetrazo colouring matters, analogous to
those mentioned in the Specification of my aforesaid Patent No. 5003, A.D. 1879,
by acting first with any of the diazo derivatives of the aromatic acids, or of their
carboxylic ethers hereinbefore mentioned, whether substituted as aforesaid or not,
on an excess of the amido compound of any hydro-carbon of the aromatic series
(further substituted as aforesaid or not), or on an excess of an amido compound of
any carboxylic or phenolic ether of such hydro-carbon (substituted as aforesaid or
not), so as to produce, in manner well known to chemists, an amido-azo-compound
or combination, and then I diazotise the amido group of the amido-azo-compound
so produced, and combine the diazo-azo-body thus obtained with my said new acid,
so as to produce a diazo-azo-colouring matter of the following or similar type,
Instead of a diazo derivative of an aromatic acid in the first member of the
immediately preceding typical formula, I may, by altering the materials with
which I work in a way which will be perfectly obvious to any chemist, have the
diazo derivative of any aromatic carboxyl ether (substituted as aforesaid or not), or
a diazo derivative of an aromatic hydrocarbon (substituted as aforesaid or not), or
of any phenolic or naptholic ether thereof, substituted as aforesaid or not); and in
the second member I may have (whichever of the possible alternatives just
mentioned I have used to form the first member) the diazo derivative (that is to
say, in the first instance the amido derivative, which I then convert into the
corresponding diazo derivative) of either such aromatic acid (substituted as
aforesaid or not) or of its carboxylic ether, or of an aromatic hydrocarbon
(substituted as aforesaid or not), or of any phenolic or naptholic ether derived from
such hydrocarbon, provided that in all cases the third or final member of the
combination consists of my said new acid or any of the substitution compounds
thereof herein before mentioned.
In the cases of colouring matters produced by the combinations described
under the preceding heads, fourth and fifth of this Specification, I may, if requisite
or desirable, sulphonate the product.
Sixth. Further, I produce colouring matters analogous to those mentioned in my
said Specification, No. 5003, A.D. 1879, by acting with my said new acid in
manner therein described on the diazo derivatives of the mixed amido-azo
compounds of the type bereinafter described, and the sulpho acids thereof (instead
of the diazo derivatives of amido-azo-benzol or its homologues, or the mono-sulpho
acids thereof, as mentioned in my said Provisional Specification, or their higher
sulpho acids, as hereinbefore mentioned). The mixed amido-azo compounds here
referred to, are such as the compounds which may be denominated azo-benzol-

page_text: -
-
-
ortho-amido-toluol (C, H, N = N - C, H, NH²), ortho-azo-toluol-amido-benzol
(C, H, N = N - C, H, NH²), azo-benzol-meta-amido-xylol (CË HË, N = N —
C, H, NH), ortho-azo-toluol-meta-amido-xylol (C, H, N = N - C, H, NH²), para-
azo-toluol-meta-amido-xylol (C, H,.N = N C, H, NH), meta-azo-xylol-amido-
benzol (C, H, N = N - C, H, NH²), meta-azo-xylol-ortho-amido-toluol (C, H, N =
NC, H, NH), azo-benzol-amido-napthalene (C, H¸ N = N – C„ H, NH²), Or
may, instead of these mixed amido-azo compounds, use the sulpho acids thereof,
whether the sulpho group or groups be in the first or second member, or whether
the said group or groups be in the said members. before combination or be
introduced by sulphonization at any subsequent stage. I may also have in the
azo and the amido members of such a mixed amido-azo-combination the diazotized
and amido derivatives respectively of aromatic hydrocarbons which are not
homologous with benzol, the same being sulphonated or not as aforesaid.
Seventh. I also prepare colouring matters by introducing one molecule of my
said new acid dissolved in glacial acetic acid at a temperature of 110° to
115° ccntegrade, gradually into a solution of nitroso-dimethylanilin hydrochlorate,
washing the "schmelze" or melt obtained with water, then dissolving it in hot
alcohol and adding muriatic acid, whereupon the colouring matter precipitates or
crystallizes out in cooling. The composition of this colouring matter I believe
-N (CH³),
to be C H
N = CH
.OH
SO³ H.
Having now described and particularly ascertained the nature of my said
Invention, and the system, mode, or manner in or under which the same is or may
be used or practically carried into effect, I would observe in conclusion that what
I consider to be novel and original, and therefore claim as the Invention secured to
me by the herein before in part recited Letters Patent is,
The production of colouring matters by means of my new acid by acting
therewith or with its sodium or other equivalent salts, or any of its substitution
compounds herein before described, on the substances or in the combinations and
according to the processes, all herein before described.
In witness whereof, I, the said Joseph Anthony Dixon, have hereunto set
my hand and seal, this Eighteenth day of July, in the year of our Lord
One thousand eight hundred and eightyone.
TAORDI
MOTOVU DIVAX
JOSEPH ANTHON
DIXON.