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What is "Heavy metal free dyes" - Definition & Explanation

Heavy metal free refers to dyes that do not require the use of heavy metals to achieve the fixation of colors. Toxic heavy metals, such as chrome, copper and zinc, which are all known carcinogens, are commonly used as fixers in dyes. And, although most heavy metals can be removed from the effluent through wastewater treatment, this often does not occur.

Some other terms

Some more terms:

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a) Threads lengthways in a fabric as woven. b) A number of threads in long lengths and approximately parallel, which may be in various forms intended for weaving, knitting, doubling, sizing, dyeing...

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