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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:

Fibers of relatively short length, inches or cm. Most natural fibers (except silk) are staple fibers. Staple fibers must be twisted or spun into yarns. Staple fibers expose more fiber ends on the...
A plain weave fabric with even or close to even thread counts in warp and weft. Often of cotton. Carded yarn versions are used for inexpensive apparel, furniture covers and as a base for laminates....
A subset of solid wastes that pose potential threats to public health or the environment and meet any of the following criteria: is specifically listed as a hazardous waste by EPA or other countries'...
A fabric with a crinkied or puckered affect, generally in the direction to the warp, which is created either by tension weaving or through the application of a caustic soda solution which shrinks...
An adhesive compound applied for the purpose of locking pile yarn tufts into a carpet backing, bonding a secondary backing to a primary backing, increasing the fabric body or stiffness, and...

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