抄録
In order to clarify whether the colorless hematoxylin absorbed in the silk fiber is oxidized to hematein by oxygen in air, the time-course of K/S-λcurve of the silk fabric dyed at the different pH with hematoxylin was investigated by keeping them at ambient temperature and humidity for 40 days. Either of the silk fabrics dyed at pH3.9 and 4.9 were colorless and, if these fabrics were exposed by air for 40days, colored to brownish yellow, implying that hematoxylin inside the fiber was oxidized to hematein. In addition, it was found that a portion of hematein absorbed in silk fabrics dyed at over pH5.9 was faded by oxygen in air. Consequently, the color yield of fabrics during storage was considered to result from a balance of the oxidation of hematoxylin and the discoloration of hematein.
