An Improved Liquid Composition for Blackboards.
Year: 1895

page_text: Date of Application, 25th July, 1895
Complete Specification Left, 25th Apr., 1896-Accepted, 13th June, 1896
PROVISIONAL SPECIFICATION.
An Improved Liquid Composition for Blackboards.
I, VICTOR BOURLEZ, of 50, Rue d'Anderlecht, Brussels, in the Kingdom of
Belgium, Chemist, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an improved liquid for surfacing blackboards as used in
schools and like places. By the use of this liquid the board is given all the
qualities and properties of natural slate and it can be written on not only with
balk, but also with schoolboys touchstone. It can be applied to metal or card-
board as well as to wood and gives an even and smooth surface which readily
receives the mark of the chalk or pencil, resists repeated washings and is very
durable. The colour is dead black and after washing leaves no trace of the chalk
or pencil.
The composition consists of the following
Ferriferous corundum
Linseed oil
Resin
Oxide of manganese
Protoxide of lead -
Turpentine
Benzine
Lamp-black
:-
340 parts.
120 parts.
43 parts.
28 parts.
28 parts.
400 parts.
6 parts.
35 parts.
The composition is made in the following manner :-
The oil, resin, oxide of manganese and protoxide of lead are heated together up
to the point of oxidation and until the resin is dissolved, the turpentine and benzine
are then poured in and the mass allowed to cool, after which the lamp black and
ferriferous corundum are added.
Dated this 95th daw of Lul- 100%
COMPLETE SPECIFICATION.
An Improved Liquid Composition for Blackboarus.
I, VICTOR BOURLEZ, of 50, Rue d'Anderlecht Brussels, in the Kingdom of
Belgium, 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 :-
This invention relates to an improved liquid for surfacing blackboards as used in
E
Beyond CION TO DIACKDATUS.
I, VICTOR BOURLEZ, of 50, Rue d'Anderlecht Brussels, in the Kingdom of
Belgium, 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 :-
This invention relates to an improved liquid for surfacing blackboards as used in

page_text: schools and like places. By the use of this liquid the board is given all the
qualities and properties of natural slate and it can be written on not only with
chalk, but also with the schoolboys touchstone. It can be applied to metal or
cardboard as well as to wood and given an even and smooth surface which readily
receives the mark of the chalk or pencil, resists repeated washings and is very
durable. The colour is dead black and after washing leaves no trace of the chalk
or pencil.
The composition consists of the following :—
The composition is made in the following manner :—
The oil, resin, oxide of manganese and protoxide of lead are heated together up
to the point of oxidation and until the resin is dissolved, the turpentine and benzine
are then poured in and the mass allowed to cool, after which the lamp-black and
ferriferous corundum are added.
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
An improved liquid for surfacing blackboards and being composed as herein-
before described
L. DUVINAGE,
Agent for Applicant.