Wool and nylon 6 fibers were treated with O2, CF4, and atmospheric He/Ar low-temperature plasmas and then dyed with acid and basic dyes respectively. The cross-sections of dyed fibers were observed with optical microscope. The diffusion of both acid and basic dyes for wool was increased by O2 plasma treatment, whereas for the O2 plasma-treated nylon 6 fiber the diffusion of acid dye was restrained and that of basic dye was increased.
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Wakida et al. (1994) studied this question.