Improvements in Translucent Enamel.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in Translucent Enamel.
We, WILLIAM LUTWYCHE, Glass Enameller, and WILLIAM BARBER
LUTWYCHE, Chemist, both of 19 Goulton Road, Lower Clapton London, N.E.,
do hereby declare the nature of this invention to be as follows:-
Our invention relates to the materials and process employed in the production
of translucent enamel.
For white enamel we employ the following materials in approximately the given
proportions.
Boracic acid
Zinc oxyde
Stannic acid
50
"
80 to 100 parts.
80
"
30
40
دو
"
Powdered flint
50
60
">
"
Feldspar
10
"
"
Fluorspar
Pearl ash
52
10
"
10
5
"
"
The specially prepared carbonate of soda known as
Sel de St. Gobain
Bone ash
->
-
25825
30
"
"
12
"
"
39259
"
"
"
"
"
"
->
Calcined borax
Nitre
Chloride of sodium
These materials are mixed and melted and then poured into water, after which
the whole mass is ground to a fine powder.
For colouring the enamel we use
For blue the compound hydrate of alumina and hydrated protoxyde of cobalt
known as Bleu de Sèvres.
For black black oxyde of cobalt and the specially prepared black oxyde of
manganese known as Oxyde Noir de Dubois.
For yellow oxyde of antimony or, oxyde of uranium.
For pink carmine.
Dated this 21st day of March 1895.
We, WILLIAM LUTWYCHE, Glass Enameller, and WILLIAM BARBER
LUTWYCHE, Chemist, both of 19 Goulton Road, Lower Clapton, London, N.E.
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:
-
Our invention relates to the materials employed in the production of translucent
enamel

page_text: For white enamel we employ the following materials in the given proportions.
Boracic acid
-
Zinc oxyde
-
Stannic acid
30
Powdered flint
Feldspar
-
Fluorspar
-
195588
80 to 100 parts.
50
80
"
"
40
">
"
50
60
"
"
10
"
10
"
Pearl ash
2
5
"
22
The special preparation of carbonate of soda known as
Sel de St. Gobain
20
Bone ash
-
25825
30
"
"
9
"
"
12
"
"
""
"
"
Calcined borax
Nitre
Chloride of sodium
These materials are mixed and melted, and then poured into water, after which
the whole mass is ground to a fine powder.
For colouring the enamel we use for blue, the compound hydrate of alumina
and hydrated protoxyde of cobalt known as Bleu de Sèvres; for black, the
preparation of oxyde of manganese known as Oxyde Noir de Dubois ; for yellow,
oxyde of antimony, or oxyde of uranium; for pink, carmine.
The proportions of the colouring materials vary according to the tint required.
The whole is mixed, melted, and ground as above described.
The enamel is applied to glass or other material in the form of a paste, which is
made by mixing the fine enamel powder with water, and applying the same to the
surface of the glass or other material by means of a brush or spatula. It is then
placed in a kiln and fired till the enamel is melted and thoroughly united with
the glass.
Having now particularly described and ascertained the nature of our said
invention, and in what way the same is to be performed, we declare that what
we claim is :-
In the manufacture of translucent enamel, the use of the materials named in the
Specification in the proportions and for the purposes specified.
Dated this 21st day of November 1895.
W. H. MUNNS,
Agent for Applicants.