Direct dyes and basic dyes is cheaper, but resistance to fastness.

直接染料和碱性染料比较便宜, 但是耐晒牢度较低.

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Is used exclusively for cotton and cellulose fibers ( reactive. Direct dyes ) and chlorine fastness improver.

是用于专用于棉和纤维素纤维 ( 活性染料. 直接染料 ) 的耐氯牢度提升剂.

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A built - up agent which can improve activity, dye - uptake of direct dyes and colour fastness developed.

研制能提高活性 、 直接染料上染率及染色牢度的增深剂.

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