Silk plain Habutae immersed in SDS, ABS and Marseilles soap (NAS) solutions were irradiated by using the ACME FADE TESTER and heated at 130～160℃. The changes of their permanences by irradiation and heating were investigated.
The decrease of tensile strength by heating was restrained by ABS immersion, which was remarkable in the case of higher temperature. In opposition, it was a㏄elerated by NAS immersion.
By irradiation, the lightness of surface color of the sample was decreased, and yellow value (b) was increased.
These lightness values of their radiation samples treated with surfactants were more decreased, but there were no differrences in b value. By heating, the lightness was decreased largely, and the b value and red value (a) were both increased, especially in the sample immersed in NAS.
The ATR spectra of the samples irradiated and heated were determined. It was found that the breaking of peptide bonds of silk was accelerated by irradiation and heating, in paticular with NAS immersion.