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

COMPOSITION OF COVER ENAMELS. 133
Other recipes, with a variety of combinations, are known,
a few of which, furnishing really good results, are subjoined :
Flint Meal .
Glass .
Porcelain .
Borax
Tin oxide .
Soda .
Potash
White lead
Saltpetre .
Chalk
Lead oxide
Magnesia .
Clay .
III.
20
20
IV.
26
26
V.*
18
VI.*
22
22
VII
20
20
22-5 40 26 30-5 26
20 29 19-5 22 20
5 3-5 2
0-5
10 14-5 9 10-5 10
5 7-5 5-5 5 5
4 2-5
The following additions are made in grinding :-
To
Flint Meal
Borax .
Magnesia
Boric acid
Soda .
Porcelain
III.
16 per cent.f
9
5
IV.
18 per cent.
9
5-25
1-5
V. and VI.
1-8 per cent.
1-0
VII.
5
3-5 parts.
3-5
0-8
0-8
3-5