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Darkening of some Commercial Titanium Dioxide in Daylight


DURING an investigation of the discoloration by light of some ceramic glazes containing titanium compounds and of the subsequent fading of the discoloration when the glaze is kept in the dark1, it was observed that certain varieties of commercial titanium dioxide are themselves affected by day-light. These varieties pass from their normal creamy colour to a deeper yellow-brown tint on exposure. The original colour is restored in the dark. This property of some commercial titania appears to have escaped notice in Great Britain, though Lee2, in his study of reversible photo-sensitivity in hackmanite, draws an analogy with a certain brand of titania which showed the property mentioned in this letter.

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WILLIAMSON, W. Darkening of some Commercial Titanium Dioxide in Daylight. Nature 140, 238–239 (1937).

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