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Laundry detergent fluorescing under ultraviolet light. Optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs), or fluorescent whitening agents (FWAs), are chemical compounds that absorb light in the ultraviolet and violet region (usually 340-370 nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420-470 nm) through the ...
Optical brightener is used to make paper appear whiter. Optical-brightening agents use fluorescence to absorb invisible radiation from the ultraviolet part of the light spectrum and re-emit the radiation as light in the visible blue range. The optical-brightening agent thus generates blue light that is added to the reflected light.
A white surface treated with an optical brightener can emit more visible light than that which shines on it, making it appear brighter. The blue light emitted by the brightener compensates for the diminishing blue of the treated material and changes the hue away from yellow or brown and toward white.
CFW is a fabric brightening dye. It is water-soluble and colorless at first. It has an optical brightening effect that has been used since the 1940s to give a whiter appearance to textiles. It is also added to laundry detergents commercially as a brightener. [7]
News 24 is the first Albanian 24-hour news television channel founded in 2002 in Tirana, Albania, by Italian journalist and former shareholder of Gazeta Shqiptare newspaper, Radio Rash, and Balkanweb portal, Carlo Bollino. [1] The channel's format resembles its Italian equivalent Rai News24. News is updated every minute.
E)-Stilbene itself is of little value, but it is a precursor to other derivatives used as dyes, optical brighteners, phosphors, and scintillators. [25] Stilbene is one of the gain mediums used in dye lasers. [26] 4,4 ′-diamino-2,2 ′-stilbenedisulfonic acid is a popular optical brightener used in some laundry detergents.
Optical brightener, an additive used to enhance the appearance of colour of fabric and paper Stress-whitening , where a white line appears when a material is stressed by bending or punching See also
Top News is a 24-hour Albanian television news channel that first aired on February 12, 2007. [2] It is a sister to, and owned by Top Channel, by association its parent company Top Media Group. [1] It is available via the TV provider DigitAlb via terrestrial, satellite, and OTT television.