• A K Chemi Dyes Enterprises

Optical Whitening Agent

Optical Whitening Agent is used in a variety of papers, particularly in papers having high whiteness. Consequently, the papers have a bright fluorescent appearance under UV illumination. These agents are dyes that absorb light in the ultraviolet and violet region (usually 340-370nm) of the electromagnetic spectrum and re-emit light in the blue region (typically 420-470nm). The range of whiteners is fabricated using fluorescent activity which has a rapid emission reaction. Using these additives enhances the appearance of color of paper or fabric, resulting in a supposed whitening effect. This method increases the general quantity of blue light reflected, making the material appear less yellow. Fluorescent dyes such as umbelliferone and stilbenes are the most familiar chemicals having the whitening property. These chemicals attract energy in the UV fraction of the spectrum and re-emit it in the blue fraction of the visible spectrum. After being treated with an optical whitener, a white surface appears whiter as it discharges additional visible light than shines on it. The yellow and brown tones of the material are hided by the blue light released by the whitener, making the material appear whiter. It is available as

• Optical whiteners
• Optical Whitening Agents (OBAs)
• Fluorescent Whitening Agents (FBAs)
• Fluorescent Whitening Agents (FWAs).