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So, again, sugar is a well-known antidote to poisoning by salts of copper; and sugar reduces those salts either into metallic copper, or into the red sub-oxide, neither of which enters into combination with animal matter. Now diluted sulphuric acid has the property of decomposing all compounds of lead with organic matter, or of preventing them from being formed.
Considerable metallurgic knowledge and skill were shown in the composition of the pigments, and the preparation and application of the glaze wherewith they are covered. The red used was a sub-oxide of copper; the yellow was sometimes oxide of iron, sometimes antimoniate of lead the Naples yellow of modern artists; the blue was either cobalt or oxide of copper; the white was oxide of tin.
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