IMPROVEMENTS IN OBTAINING A WHITE PIGMENT, AND IN THE PROCESS EMPLOYED THEREFOR.
Year: 1874

page_text: LETTERS PATENT to John Bryson Orr, of Glasgow, in the County of
Lanark, North Britain, Manufacturing Chemist, for the Invention
of "IMPROVEMENTS IN OBTAINING A WHITE PIGMENT, AND IN THE PROCESS
EMPLOYED THEREFOR.
"
Sealed the 7th August 1874, and dated the 10th February 1874.
PROVISIONAL SPECIFICATION left by the said John Bryson Orr at the
Office of the Commissioners of Patents, with his Petition, on the
10th February 1874.
I, JOHN BRYSON ORR, of Glasgow, in the County of Lanark, North
Britain, Manufacturing Chemist, do hereby declare the nature of the
said Invention of "IMPROVEMENTS IN OBTAINING A WHITE PIGMENT, AND IN
THE PROCESS EMPLOYED THEREFOR," to be as follows, that is to say :—
This Invention relates to the obtainment of a new or improved white
pigment, and to improvements in the process for producing the same.
For the purpose of carrying out this Invention crude sulphuret of
barium is thoroughly lexiviated and the supernatant liquor drawn off

page_text: and divided into two or more equal portions. To one such portion an
equivalent of zinc chloride is added, and to this is again added an
equivalent of zinc sulphate, after which a further equal portion of the
solution of barium sulphide is also added, the result being an intimate
mixture of one equivalent of barium sulphate and two equivalents of
zinc sulphide. The precipitated compounds or combinations of zinc and
barium are collected, pressed, and dried, after which they are placed in
a retort or furnace and heated, and while still hot the product is drawn
into cold water. The sudden cooling thus produced has the effect of
increasing the density and imparting body to the product. The product
is now washed and ground in water to a fine powder and dried, the
result being a white pigment of great purity and body.
2
110
T
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Bryson Orr in the Great Seal Patent Office
on the 7th August 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
BRYSON ORR, of Glasgow, in the County of Lanark, North Britain,
Manufacturing Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Tenth day of February, in the year of
our Lord One thousand eight hundred and seventy-four, in the 37th
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said John Bryson Orr, Her special license that I, the
said John Bryson Orr, my executors, administrators, and assigns, or such
others as I, the said John Bryson Orr, my executors, administrators, or
assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and vend, within the United King-
dom of Great Britain and Ireland, the Channel Islands, and Isle of
Man, an Invention for "IMPROVEMENTS IN OBTAINING A WHITE PIGMENT, AND

page_text: IN THE PROCESS EMPLOYED THEREFOR," upon the condition (amongst others)
that I, the said John Bryson Orr, by an instrument in writing under.
my hand and seal, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be per-
formed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the
said Letters Patent

page_text: the first portion is added an equivalent of zinc chloride, or nitrate of
zinc may be used instead of the chloride, after which there is poured
into the vessel containing them,—

page_text: sudden chilling of the same, whether pressed or not, and thereby pro-
ducing a white pigment, as herein-before described.
In witness whereof, I, the said John Bryson Orr, have hereunto
set my hand and seal, this Seventh day of August, One thousand
eight hundred and seventy-four.