| Optical Brightener |
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Information AboutOptical Brightener |
| CATEGORIES ABOUT OPTICAL BRIGHTENER | |
| dyes | |
| cleaning product components | |
| luminescence | |
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This creates a whitening effect by making materials look less yellow and by increasing the overall amount of light reflected to the eye. The most common class of chemicals with this property are the Stilbene s. These chemicals are commonly part of Laundry Detergent s to replace FWA removed during washing and enhance the appearance of garments. The Molecules that make up these additives are Fluorescent dyes such as Umbelliferone , which absorb energy in the UV portion of the spectrum. This energy is then re-emitted in the blue portion of the visible spectrum. A white surface treated with an optical brightener emits more visible light than shines on it, making it appear brighter. The blue emitted hides yellow and brown tones, making treated materials appear whiter. Optical brighteners have replaced Bluing which was formerly used to produce the same effect. The additives are commonly used in washing powders, Detergents , and in Paper manufacture, with the result that white paper and clothing show up as strongly fluorescent under UV illumination. Paper used for banknotes does not contain optical brighteners, so a common method for detecting Forged notes is to check for fluorescence. |
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