| http://www.w3.org/ns/prov#value | - Suitable substances are hydroquinone, p-methoxyphenol, 2,6-di-tert-butyl-p-cresol, ??-naphthol, phenothiazine, pyridine, nitrobenzene, m-dinitrobenzene or chloranil; thiazine dyes, such as Thionine Blue G (C.I. 52025), Methylene Blue B (C.I. 52015) or Toluidine Blue (C.I. 52040), and N-nitrosamines, such as N-nitrosodiphenylamine, and the salts, for example the potassium or aluminum salts, of N-ni
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