Year: 1886

page_text: I, DAVID SWAN, of Braeside, Maryhill, in the County of Lanark, North Britain,
Chemist, do hereby declare the nature of this Invention to be as follows, that
is to say:
My said Invention has for one of its objects to utilise a bye product consisting
of protochloride of iron, and arising in the galvaniser's and other arts; but it is also
advantageouly applicable when the said protochloride is specially made for the
purpose of producing pigments.
In carrying out my Invention I mix with the solution of protochloride of iron,
carbonate of lime, or other carbonate of an alkaline earth; and I subject the mixture
to agitation and aeration. Air may be forced through the mixture so as to produce
the agitation; or the inixture may be agitated by rotating paddles, screws, or other
appliances in a manner to thoroughly mix air with it; or again agitation by paddles
or the like and forcing of air through the mixture may be combined. The result of
the operation is to form a solution of chloride of calcium or other metal and a
precipitate which is of a color varying from yellow to red and is well suited for use
as a pigment. The precipitated pigment is finished by washing and drying; whilst
the chloride may be utilised in any known way.
EDMUND HUNT,
Applicant's Agent.

page_text: I, DAVID SWAN, of Braeside, Maryhill, in the County of Lanark, North Britain,
Chemist, 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, that is to say :-
.
My said Invention has for one of its objects to utilise a bye product consisting
of protochloride of iron, and arising in the galvaniser's and other arts; but it is
also advantageously applicable when the said protochloride is specially made for
the purpose of producing pigments.
In carrying out my Invention I mix with the solution of protochloride of iron,
carbonate of lime or other carbonate of an alkaline earth and I subject the mixture
to agitation and aeration. The carbonate of lime or other earth is by preference
added in a powdered condition. Air may be forced through the mixture so as to
produce the agitation; or the mixture may be agitated by rotating paddles, screws,
or other appliances in a manner to thoroughly mix air with it; or again agitation
by paddles or the like and forcing of air through the mixture may be combined. The
result of the operation is to form a solution of chloride of calcium or other metal,
and a precipitate which is of a yellow color and is well suited for use as a pigment.
If the mixture contains as much protochloride of iron as corresponds to 56 parts
by weight of metallic iron, and 100 parts of carbonate of lime, the resulting
pigment will be of a deep yellow color inclining to orange, whilst if there is a
larger proportion of carbonate of lime the pigment will be of a paler or lighter
yellow color. If a red color is desired it can be obtained, as is well known, by
heating or calcining the deep yellow pigment, this pigment being in fact a very
pure oxide of iron."
The precipitated pigment is finished by washing and drying; whilst the chloride
may be utilised in any known way.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is:-
11
The obtaining of pigments by mixing carbonate of lime or other carbonate of an
alkaline earth with a solution of protochloride of iron and subjecting the mixture
to agitation and aeration substantially as herein before described.
Dated this twelfth day of November 1886
EDMUND HUNT,-
Applicant's Agent,