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Phototransformation is not applicable to Boron compounds. Magnesium metaborate is converted into boric acid/borate upon dissolution in water. Boric acid is an inorganic compound without any light absorption characteristics in dilute solutions. It is therefore unlikely that the concentration of boric acid in water is influenced by light. Boric acid is therefore considered to be resistant to photochemical degradation. No further information is available. In accordance with REACH Regulation (EC) 1907/2006, no data about phototransformation in air is required.