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When a vapour, at atmosphere pressure wa...

When a vapour, at atmosphere pressure was gradually heated from `25^(circ)C` its colour wasa found to deepen at first and then to fade as the temperature was raised above `160^(circ)C`. At `600^(circ)C`, the vapour was almost colourless, but its colour deepended when the pressure was raised at this temperature. The vapour was:

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