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Fluorescent Whitening Agents

FWAs are colourless dyes that absorb ultraviolet light and re-emit it in the visible part of spectrum. The most often used FWAs are for example Ryluxes of various make. The spectrum of visible radiation extends from frequency 380 to 760 nanometres and includes violet - blue - green - yellow - orange - red shades of colours. Ultraviolet radiation (UV) has a wavelength shorter than 380 nanometres. In greyish products the violet - blue colours are often missing. FWAs are able to shift the wavelength of such UV radiation to the violet - blue part and thus "whiten" - vivify the greyish fabric. The dyes can be used separately in dye baths up to 50 grades for approximately twenty minutes. They can also be added to finishing baths after for example peroxide bleaching.



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Evropská unie Education and Culture This project has been funded with support from the European Commission. This publication [communication] reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
This project has been funded with support from the European Commission.
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