| prov:value
| - In the third full paragraph of such column 1, it is disclosed that: ???It is known that certain dyes, for example eosin, Bengal Rose, methylene blue and others, have a so-called photodynamic action, i.e. on irradiation with light, they act as catalysts for the oxidation of various substrates with oxygen [see, for example, G. O, Schenck, Angew.
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