Discussion
Colour in a glaze is produced chiefly by
Answer: B
Correct answer: transition metal oxides dissolved in the glass
Colour comes from transition metal ions dissolved in the glass: cobalt for blue, copper for green or red, iron for amber and celadon, manganese for purple. Because the ion is in solution the colour depends not only on which metal is present but on its oxidation state and its surroundings - which is why the kiln atmosphere changes copper from green to red.
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