Improved Process for Producing Artificial Veined Coloured Marble.
Year: 1896

page_text: Date of Application, 5th Aug., 1895-Accepted, 12th Dec., 1896
COMPLETE SPECIFICATION..
Improved Process for Producing Artificial Veined Coloured
Marble.
:
J, MAX BERNSTEIN, Proprietor of the Firm of Joh. Friedr. Wallmann & Co.,
Patent Attorneys, of 74 Blumen Strasse Berlin Germany do hereby declare the
nature of my invention and in what manner the same is performed to be
particularly described and ascertained in and by the following statement :-
The object of the present invention is to produce artificial marble which shall
be exactly similar to the natural mineral.
Hitherto it has only been possible to produce artificial marble of one colour, but
according to the present invention exact imitations of the finest marble in colour
as also in the veins are attained.
The constituent parts of the novel product are mainly marble waste, limestone,
or other stone capable of being polished, which may either be employed in its
natural colour or mixed with a colouring medium and used as fundamental mass,
the whole is then mixed with a suitable binding medium and allowed to harden.
In order to produce the veins, any desired colours, specially prepared for the
purpose may be employed said colours being laid on the fundamental mass.
The material of which the new product is composed consists mainly of the waste
produced in polishing stones such, for instance as pulverised white marble which is
employed either alone or in combination with some suitable colouring mass to form
the ground or fundamental mass and which is mixed with some suitable binding
means and allowed to harden under a slight pressure. The veins in artificial
marble have hitherto been formed by adding suitable colouring matters directly to
the mass, but according to the present invention the colouring matters are previously
mixed with the suitable quantity of pulverised white marble and brought into the
fundamental mass in this mixed state.
The proportions of the pulverised marble and the colouring mass mixed to form
the ground may vary according to the colour of the product to be obtained, but it
is advantageous to mix equal quantities of both substances, and this should also be
done in preparing the mass to form the veins.
I will now proceed to give examples of carrying out my invention, in producing
imitation black and white marble.
a. White marble-Pulverised marble and a suitable binding means of any of
the known kinds are mixed until a thick fluid pasty mass is obtained this mass is
then poured into a mould of any suitable material and lines are made on the
mixture, after the manner of veins of marble, by means of a trowel, said lines being
formed with a mixture of equal parts of pulverised white marble and Francfort
black. The mould is then closed and subjected to a slight pressure, and the
contents of the same allowed to harden.
b. Black marble:-Equal parts of pulverized marble and Francfort black are
mixed and a suitable binding means added to the mixture and the whole stirred
until it forms a thick pasty mass. This mass is then poured into the mould and
veins like streaks produced in the same by adding a mixture of pulverised white
marble and ochre, the veins being marked on the same by means of this mixture.
After this has been done the mould is closed, subjected to a slight pressure and the
mass allowed to cool. The mass forming the veins, which in the latter case should
also consist of equal parts of ochre and pulverised white marble. The mass forming
the veins should also be of a thick pasty consistency.

page_text: A binding material which I find convenient for use is prepared as follows:-
One part of magnesite and two parts of a solution containing 20 per cent. of
chloride of magnesium are mixed together, and added to 5 parts of the dry
mixture.
The marble produced by the above described process is capable of being polished
and may be worked in a similar manner to sandstone.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
A process for producing artificial, veined, coloured marble according to which
uot only single coloured but particularly the variegated kinds of marble are
produced from the waste of all kinds of stone capable of polish, the colour and
veins of such imitations being sharply marked, substantially as described.
Dated this 5th day of August 1896.
BOULT & WADE,
Agents for the Applicant.