Enamels and enamelling; an introduction to the preparation and ...

130 ENAMELS AND ENAMELLING.
The recipes for cover enamels are far more numerous than
those for ground masses. The manner in which the formulae
should be modified depends in either case on the purpose for
which the product is intended.
RECIPES FOR COVER ENAMELS.
The recipes given below have proved thoroughly reliable
in practice.
Leadless Cover Enamel for Cooking Utensils.
Flint meal 37*5 parts.
Borax 27-5
Tin oxide 30
Soda 15
Saltpetre . . 10 ,,
Ammonium carbonate 7-5 ,,
Magnesia 7 ,,
fused together and ground with
Flint meal 6-12
Tin oxide 3'66
Soda 0-70
Magnesia
-
. . .
-
70 ,,
In nearly all enamel works it is customary to store the
mass, when ground, in a moist state, in suitable drums or casks
with close-fitting lids.
Plumbiferous
Cover Enamel No. 1.
Silica .
Borax .
Tin oxide .
White lead
Soda .
.
.
.
.
.
.
.
.
.
, .
. .
...
...
.
. .
75 parts.
.48
. .50 ,,
. . .30
.... 22-5
Saltpetre . ,-
Ammonium carbonate
Magnesia ...
.
.
..'
. . . . .
20
15
.10 ,,
fused together and ground with
Flint meal . . . 12-6