16.10.21

Enamelling metal.

Practical Magazine 14, 1876

The use of coloured enamels on large surfaces is yet in its infancy. The ordinary grey enamel (so called) is really not an enamel, but a transparent glaze, the apparent grey colour of which is produced by the surface of iron beneath the glaze.

Grey Micture Enamel.
Sand ..... 10 lbs. 0 ozs.
Red lead ..... 33 0
Boracic acid ..... 20 0
Cullett (broken glass) ..... 114 0
Bicarbonate of soda ..... 16 0
Nitre ..... 1 2
Manganese ..... 0 8½

Grey Mixture Enamel
Flint ..... 36 lbs. 0 ozs.
Boracic acid ..... 24 0
Bicarbonate of soda ..... 24 0
Nitre ..... 18 0

White Mixture Enamel
Cullett ..... 11 lbs. 0 ozs.
Boracic acid ..... 7 0
Bicarbonate of soda ..... 0 4
Phosphate of lime ..... 3 8
Oxide of antimony ..... 0 2

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