IMPROVEMENTS IN MANUFACTURING A GREEN COLORING MATTER
Year: 1864

page_text: PROVISIONAL SPECIFICATION left by Richard Archibald Brooman at
the Office of the Commissioners of Patents, with his Petition, on the
4th March 1864.-A communication to him from abroad by Otto Bredt,
residing at Barmen, Rhenish Prussia.
I, RICHARD ARCHIBALD BROOMAN, of 166, Fleet Street, in the City of
London, Patent Agent, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN MANUFACTURING A GREEN COLORING MATTER," to be as
follows:-
This Invention consists in manufacturing a green "coloring matter, as here-
after explained, applicable in dyeing, printing, and generally as a green color.
As dishydrogenized alcohol (aldehyde) which is used in producing this color,
and as sold in commerce, does not possess the qualities necessary for the
purposes of this Invention, I prepare it as follows:-To 350 parts of sulphuric
acid I add 150 parts of water, mix and leave to cool; I then add 320 parts
of alcohol of commerce at 90° Beaumé. I pour this mixture into a glass or
earthen vessel having a cock at bottom; the contents are allowed to pass by
degrees into a glass globe or vessel, or into a retort with a return neck; an
aperture is made in the glass vessel for introducing a glass funnel. The
vessel or retort contains 300 parts of bichromate of potass in small pieces
and 150 parts of water. Heat by a water bath, sand bath, or naked fire,
according to the receiver used, is applied, and the matters escaping from the
vessel or retort fall into another vessel containing cold water and a coil. The
aldehyde or dishydrogenized alcohol thus prepared should be neutral. I rectify
it twice by means of glass or earthen vessels provided with a cock, from which

page_text: the matter escapes gradually, and falls again into a vessel containing cold
water and a coil. Then to produce the green coloring matter, I place in a
receiver with a straight neck 1 part of crystallized fuchsine and pour upon it
1 part of sulphuric acid and part of cold water previously mixed together;
I then dissolve these matters under a gentle heat, allow to cool, and add
4 parts of the aldehyde, prepared as before described; the solution imme-
diately assumes a violet color. I heat the receiver in a water bath, holding it
by the neck; in a few minutes the matter changes to a blue color, when I
withdraw the receiver from the bath. To be assured that the matter is in the
state it should be, pour a drop in a small quantity of water acidulated with
sulphuric acid, and by blowing upon it there should appear a beautiful pure
blue tint. If the water appears violet or of a violet shade, the receiver should
be returned to the water until the test yields a pure blue tint; then pour into
the receiver boiling water, and at the same time a solution of hyposulphurous
soda, agitate the mass, and filter through a cloth filter lined with paper to
prevent contact with any impurities there may be in the cloth, and allow the
matter filtered to cool. I pass over the residues boiling water until complete
solution, and allow the filtered matter to cool about 24 hours. I filter a
second time as before, and precipitate the filtrate with chlorate of zinc, that is,
butter of zinc, at 58° Beaumé, and dissolved crystallized soda at 17° Beaumé.
I again filter, and the matter obtained in the filter forms the substance which
is the green coloring matter; I dry it in a stove at a temperature of from
about 85° to 105° Fahrenheit, and pulverize it. This color may be sold in
paste, loaf, or powder, according to the purposes to which it is to be applied.