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Dyes Dyeing Condition (pH) Acid (Wool) 2-4, 4-6, 6-8 (depends on types of dyes) Acid (Nylon) 4.5-5.5, 6-7 (depends on types of dyes)
http://www.en.rmutt.ac.th/prd/picforttcexpert/2004/02Dyeing_English.ppt
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