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The porcelain insulators are brown in colour. Why?

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closed as off topic by Qmechanic, David Z Aug 18 '12 at 2:59

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This reads a bit like a trivial question. If it is intended as a physics question it should probably be clarified. – dmckee Aug 17 '12 at 13:34

In my country they are white for domestic use. So it must be a colorant.

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