Wool and silk fabrics dyed with Kayakalan Black 2RL (C. I. Acid Black 155) were plasmatreated with O
2, N
2, Ar, NH
3, and CF
4 gases. Part of the dyed fabric was plasma-treated after silicone resin treatment. While O
2 plasma treatment considerably increased the color depth, other gases had so significant effect on the depth. Although, silicone resin treatment itself increased the color depth because of the low refractive index, aftertreatment with O
2 plasma was not effective. The O
2 plasma treatment formed many microcraters on the fiber surface, but N
2, Ar, NH
3, and CF
4 gases did not, Judging from the results of scanning electron microscope (SEM) and electron spectroscopy for chemical analysis (ESCA), it is considered that the microcrater formation by the O
2 plasma treatment plays an important role in increasing the color depth.
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