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what is optical brightener

Optical brighteners are synthetic chemicals added to liquid and powder laundry detergents.
Optical brighteners make clothing appear whiter and brighter, and thus cleaner.
Optical brighteners are the modern-day replacement for the decades-old practice of bluing—adding small amounts of blue dye to fabric to make it appear whiter.

Optical Brightener KCB
Chemical name: 1.4 - two (benzoxazole -2- base) naphthalene
Molecular formula: C24H14O2N2
Molecular weight: 362
Properties: Yellow-green crystalline powder, bright blue color, melting point 212 C, insoluble in water, maximum absorption wavelength is 370 mm.
Technical conditions:
Standard: HG/T 5097-2016
Appearance: yellow green powder
Chromatic light: bright blue light
Melting point: 210 ~ 212 C
Solid content: greater than or equal to 98%
Fineness: through 100 mesh
Ultraviolet absorption: more than 500
Volatile: less than 0.5%
Ash: less than 0.5%
mainly used for EVA foaming, shoes, synthetic fibers and plastics whitening, can be used for plastics Pu film, molding materials, injection molding materials whitening, but also can be used for polyester fiber, dyes, natural paint whitening.
Packaging and storage: 25 kilograms cardboard drum packaging; in a cool, dry place to avoid light preservation.

 Now an integral part of all washing powders, optical brighteners are dyestuffs absorbed by textile fibres from solution but not subsequently removed in rinsing.
What is optical brightener? Optical brighteners don't work forever. They fade with time and exposure to UV rays, and while doing so are absorbed into your skin. But while the illusion of their usefulness does fade, their toxic effects do not.