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What is "Fluorescent Brightener" - Definition & Explanation

A substance that is added to a textile (uncoloured or coloured) to increase the apparent light reflectance in the visible region by the conversion of ultraviolet radiation into visible light and so to increase the apparent brightness or whiteness of the textile.
Fluorescent brightening agents or optical brightening agents or fluorescent whitening agents are dyes that absorb light in the ultraviolet and violet region of the electromagnetic spectrum, and re-emit light in the blue region.

Some other terms

Some more terms:

A strong, rugged cloth made with a pronounced raised cord on a 63-degree twill weave. The weaves used for calvary twill and elastique are the same. Cavalry twill has a somewhat coarser rib effect...
The combing process is an additional step beyond carding. In this process the fibers are arranged in a highly parallel form, and additional short fibers are removed, producing high quality yarns with...
A process in which a fabric is printed with an adhesive, followed by the application of finely chopped fibres over the whole surface of the fabric by means of dusting-on, an air blast, or...
Knit - The most common type of knit formed by interlocking loops in the widthwise direction. Weft knit tend to have more stretch than warp knits. Examples are interlock, jerseys, double knits, rib...
This is both the name of a fabric and a fiber. A manufactured fiber introduced in the early 1950s, it is second only to cotton in worldwide use. Its ability to stretch and resist wrinkling makes it a...

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