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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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Desirable changes in wood that provide interesting patterns at the surface. Examples are: flame, crotch (curl, Brit.), burl (burr, Brit.) , curly (tiger stripe, fiddle, fiddleback) and birdseye....
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A loose, sleeved coat-like garment worn over an inner garment like the angarakha (q.v.), generally sumptuous and appropriate for ceremonial occasions. Of Turkish origin, the chogha was also known as...
The term used for passing fabric through big continuous ovens called stenters. In addition to just drying stenters can align fabrics, set fabrics, apply chemicals to fabrics via pad mangles. Stenter...

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