AN IMPROVED BLACK PIGMENT
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, JAMES CONNOR, of Meadowside, Airdrie, in the County of Lanark, North
Britain, Painter and Color Maker, do hereby declare the nature of my said
invention for "AN IMPROVED BLACK PIGMENT" to be as follows:-
My said Invention consists in making an improved black pigment of good color,
and covering and drying properties, in an economical manner and by using an
abundant and inexpensive material not hitherto applied to the same purpose.
The material I employ in carrying out my Invention is a bitumenous or
carbonaceous mineral of a kind more or less resembling coal and bitumenous shale
and known as "bonnet" in localities where coal and shale are found. I grind this
bonnet to a fine powder, in which form it may be used as a somewhat inferior
pigment. I however prefer to mix the ground bonnet with about five per centum
of lime and to heat the mixture in a retort so as to drive off some gas and oil vapor,
this process considerably improving the color and other properties of the material.
The material after being thus heated is reground, and subjected to elutriation and
other finishing processes employed in pigment making.
My improved pigment combines well with oils and other media to form paints
and imparts thereto quick drying properties, in illustration of which it may be
stated that a paint made with it and raw linseed oil becomes quite dry in ten hours.
Dated this second dev of Santamber 1984
EDMUND HUNT,
Applicant's Agent.

page_text: F
I, JAMES CONNOR of Meadowside Airdrie, in the County of Lanark, North
Britain, Painter and Color Manufacturer, do hereby declare the nature of my said
invention for "AN IMPROVED BLACK PIGMENT" 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 consists in making an improved black pigment of good color
and covering and drying properties in an economical manner and by using an
abundant and inexpensive material not hitherto applied to the same purpose.
The material I employ in carrying out my Invention is a bitumenous or
carbonaceous mineral of a kind more or less resembling coal and bitumenous shale
and known as "bonnet" in localities where coal and shale are found. I grind this
bonnet to a fine powder in which form it may be used as a somewhat inferior
pigment. I however prefer to mix the ground bonnet with about five per centum
of lime and to heat the mixture in a retort so as to drive off some gas and oil vapor,
this process considerably improving the color and other properties of the material.
Along with the gas and oil vapor appreciable quantities of ammonia are evolved and
may be combined with sulphuric or other suitable acid in the usual way, the value
of the ammonia thus obtained going to reduce the cost of the black piginent. The
material after being heated as described is reground, and subjected to elutriation
and other finishing processes employed in pigment making.
My improved pigment combines well with oils and other media to form paints
and imparts thereto quick drying properties, in illustration of which it may be
stated that a paint made with it and raw linseed oil becomes quite dry in ten hours.
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
•
The obtaining of an improved black pigment from the material herein specified
and substantially in the manner hereinbefore described.