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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