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| - The bath having bleaching ability or a pre-bath thereof may use various compounds as the bleaching accelerator and, for example, compounds having a mercapto group or disulfide bond described in U.S. Pat. No. 3,893,858, German Patent 1,290,812, JP-A-53-95630 and Research Disclosure, No. 17129 (Jul., 1978), and thiourea-base compounds or halides such as iodine and bromide ions described in JP-B-45-8
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