The photo-induced colour reversion of handsheets of unbleached and bleached stoneground wood pulp was studied by FT-IR transmission spectroscopy. Changes in the chemical structure of thin handsheets were monitored quantitatively as a function of repeated exposures to UV irradiation at 320 nm followed by storage in the dark. A slight loss of carbohydrate structures was observed throughout the cycles, while a pronounced loss in lignin aromaticity was produced by the UV irradiation.
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Kimura et al. (1992) studied this question.
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