grain
... basic dye 碱染料，硷性染料 fast dye 不褪色染料 lac dye 紫胶染料 ...
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我们担保这些染料不褪色。
We guarantee the fastness of these dyes.
youdao
我们用一种不褪色的染料染这种衣服。
We dyed the cloth with a fast colour.
这一领域中另一些重要进展是不褪色，即在洗涤衣物时染料不会被洗掉。
Other major advances in this sphere have been in color-fastness, i. e. , resistance to the dye being washed out when the garment is cleaned.
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