Abstract
AbstractTitanium dioxide powders, prepared by the hydrolysis of titanyl sulphate, discolour in a vacuum. The discoloration is stable in dry oxygen or dry air, but it bleaches in the presence of water vapour. Infra‐red and thermogravimetric measurements show that the discoloration and bleaching cycle is associated with the state of adsorption of hydrogen‐bonded water by sulphate impurities on the titanium surface.
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