AN IMPROVED MANUFACTURE OF COLORED PLASTER OR CEMENT."
Year: 1880

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane, in the
"f
County of Middlesex, Patent Agent, for an Invention of AN IMPROVED
MANUFACTURE OF COLORED PLASTER OR CEMENT." A communication from
abroad by Charles François Fabre, of Paris, France.
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark at
the Office of the Commissioners of Patents on the 10th June 1880.
"
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent.
AN IMPROVED MANUFACTURE OF COLORED PLASTER OR CEMENT."
[A communication from abroad by Charles François Fabre, of Paris, France.]
This Invention relates to the manufacture of colored plaster or cement of colored
sands and lime prepared for sale in a dry pulverulent condition in readiness for
immediate use, without other admixture than water.
The mode of manufacture is as follows:-The sands are first washed in order to
eliminate their impurities, by sand being understood all those substances which
have been hitherto employed in the manufacture of ordinary mortar, plaster, or
cement, including free stone grit
The washed sands are colored in any suitable manner, those methods being
adopted by which the colors are permanently fixed. I prefer however the following
coloring process on account of the absence of chemical agents liable to prejudicially
affect, the properties of the plaster or cement :-1 first form a milk of lime, and color
it with any suitable coloring matter, and when the tint is perfectly homogeneous I
add the washed sand in suitable proportion, according to the quantity and fluidity
of the milk of lime. After well stirring and mixing together the surplus liquid is
drained off, and when the residue has been sufficiently dried, either by exposure in
the open air or in kilns or otherwise, the sands thus colored and "mordanted "
are reduced to a fine powder. To this powder I then add a suitable proportion of
slaked lime, cement, or plaster in a powdered form. In this manner a colored
plaster or cement is produced in a dry state ready for use, and requiring only the
addition of water. For transport to a distance the plaster or cement would be
Driss AJ1

page_text: kept in the dry state, but when intended for immediate use in the vicinity of the
place of manufacture the usual quantity of water may be at once added.
The following are the advantages obtained by the use of this improved product :-
(1) Perfect uniformity of color of the house fronts or other walls to which the
plaster is applied, without the necessity of exercising any skill in mixing the
colors, the plaster being applied in the same way as ordinary plaster; (2) greater
durability of colored surface, as the color forms an integral constituent of and
permeates through the plaster, whereas ordinary coloring only forms a thin
crust upon the plaster, possessing little durability and very liable to flake off;
(3) saving of labor, as the finishing coat of plaster and the coloring are applied at
one and the same operation; a saving of time is also effected, as it is unnecessary
to wait until the plaster is dry before coloring; the usual 3 coats of lime white and
color are also dispensed with.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alexander Melville Clark in the Great Seal Patent Office on the 10th
December 1880.
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent. "AN IMPROVED MANUFACTURE OF COLORED PLASTER OR CEMENT."
A communication from abroad by Charles François Fabre, of Paris, France.
This Invention relates to the manufacture of colored plaster or cement composed
of colored sands and lime in the proper proportions, and prepared for sale in a dry
pulverulent condition in readiness for immediate use without other admixture
than water.
The
The mode of manufacture is as follows:-The sands are first washed in order to
eliminate their impurities, by sand being understood all similar substances which
have been hitherto employed in the manufacture of ordinary mortar, plaster, or
cement, including freestone grit or dust resulting from dressing freestone.
washed sands are colored in any suitable manner, those methods being adopted by
which the colors are permanently fixed. I prefer however the following coloring
process on account of the absence of chemical agents liable to prejudicially affect
the properties of the plaster or cement:-I first form a milk of lime and color it
with any suitable coloring matter, and when the tint is perfectly homogeneous
add the washed sand in suitable proportion, according to the quantity and fluidity
of the milk of lime. After well stirring and mixing together the surplus liquid is
drained off, and when the residue has been sufficiently dried, either by exposure
in the open air or in kilns or otherwise, the sands thus colored and "mordanted
are reduced to a fine powder. To this powder I then add a suitable proportion of
slaked lime in powder. In this manner a colored plaster or cement is produced in
a dry state ready for use, and requiring only the addition of water. For transport
to a distance the plaster or cement would be kept in the dry state, but when
intended for immediate use in the vicinity of the place of manufacture the usual
quantity of water may be at once added.
"
The following are the advantages obtained by the use of this improved product :-
(1) Perfect uniformity of color of the coat of plaster when applied to house fronts
or other walls, whatever may be their extent of surface, without the necessity of
exercising any skill in mixing the colors, the plaster being applied in the same way
as ordinary plaster; (2) greater durability of the colored surface, as the color forms
an integral constituent of the plaster, and permeates the entire thickness at least
of the finishing coat of plaster, whereas ordinary coloring only forms a thin crust
upon the plaster, possessing little durability and very liable to flake off; (3) saving
of labor, as the finishing coat of plaster and the coloring are applied at one and the
same operation; a saving of time is also effected, as it is unnecessary to wait until
the plaster is dry before coloring; the usual three coats of lime white and color are
also dispensed with, and the frequent erection and removal of scaffolding, &c.,
avoided. Any quality of lime, cement, or plaster may be used in the composition
of this improved colored cement or plaster which is capable of producing a similar
result.
Having described the nature of the said Invention and the manner of performing
the same, I declare that what I claim as the Invention to be protected by the
hereinbefore in part recited Letters Patent is,-
First. The manufacture of colored plaster or cement of a combination of sand,
quicklime, coloring matter, and slaked lime, in the manner herein described, the
said colored plaster or cement being ready for use without other admixture than
water, as specified.

page_text: Second. In the manufacture of colored plaster or cement composed of sand,
quicklime, coloring matter, and slaked lime, the introducing the coloring matter
by mixing it with milk of lime and then saturating the sand or other matter
colored thereby with slaked lime in powder, as and for the purpose specified.
In witness whereof, I, the said Alexander Melville Clark, have hereunto set
my hand and seal, this Tenth day of December, in the year of our Lord
One thousand eight hundred and eighty.
A. M. CLARK. (L.S.)