Retardation of the photoyellowing of untreated wool and wool treated with fluorescent whitening agents by the action of reducing agents

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Abstract
Different chemically treated wools have been exposed to radiation in the presence of different aqueous reductive bleaching agent solutions. It was observed that thiourea dioxide gave the best performance and, in the case of wool serge, led to a fabric having a better light fastness. An interesting beneficial synergistic effect was uncovered when the reducing agents were used in conjunction with formaldehyde. Biphenols (models for dityrosine) have also been padded onto wool and exposed to light in the wet state to mimic the photoyellowing of dityrosine. 0, 0′‐Biphenol‐treated wool was exposed to light in the presence of the reducing agents and these were found to decrease the amount of discoloration produced by degradation of 0, 0′‐biphenol.

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