| http://www.w3.org/ns/prov#value | - Moreover, examples of the above-mentioned chemical treatment include an oxidation method using contact with air, a gas phase oxidation method using reaction with a nitrogen oxide or ozone, a wet oxidation method in which the pigment surface is oxidized in water using an oxidizing agent such as nitric acid, potassium permanganate, potassium dichromate, chlorous acid, perchloric acid, a hypohalite,
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