In order to establish the bleaching method for cotton fabrics under the neutral or acid condition, the cotton fabrics were pretreated by iron(II) sulfate before subsequent hydrogen peroxide bleaching. The white index and tensile strength at break for yarns from bleached fabrics were measured and considered concerning the pretreated condition by iron(II) sulfate. It was revealed that the high white index attained, by contraries, tensile strength for yarns decreased ca. 20% by processing. However, an addition of a small amount of sodium hydroxide into bleaching bath enabled to depress a decrease of tensile strength for yarns. In addition, it was observed by ESR measurement that an amount of radicals increased when a small amount of NaOH was added into hydrogen peroxide solution in the presence of iron (II) sulfate.%綿布の漂白には従来，亜塩素酸ナトリウム，次亜塩素 酸ナトリウム，過酸化水素などが使用されてきた．一方， 精練に関して，綿織物に酵素を用いてマイルドな温度，pH で精練する方法が近年になり開発された[1].付 それにとも ない，酵素精練の強アルカリを用いないという利点を生 かしたエコ・フレンドリーな漂白法が求められるように なった．
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