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  2. Allura Red AC - Wikipedia

    en.wikipedia.org/wiki/Allura_Red_AC

    Allura Red AC, also known as FD&C Red 40 or E129, is a red azo dye commonly used in food. It was developed in 1971 by the Allied Chemical Corporation, who gave the substance its name. [1] [2] It is usually supplied as its red sodium salt but can also be used as the calcium and potassium salts. These salts are soluble in water.

  3. Molar absorption coefficient - Wikipedia

    en.wikipedia.org/wiki/Molar_absorption_coefficient

    The SI unit of molar absorption coefficient is the square metre per mole (m 2 /mol), but in practice, quantities are usually expressed in terms of M −1 ⋅cm −1 or L⋅mol −1 ⋅cm −1 (the latter two units are both equal to 0.1 m 2 /mol).

  4. Mathematical descriptions of opacity - Wikipedia

    en.wikipedia.org/wiki/Mathematical_descriptions...

    absorption coefficient is essentially (but not quite always) synonymous with attenuation coefficient; see attenuation coefficient for details; molar absorption coefficient or molar extinction coefficient , also called molar absorptivity , is the attenuation coefficient divided by molarity (and usually multiplied by ln(10), i.e., decadic); see ...

  5. FDA may finally ban artificial red food dye from foods - AOL

    www.aol.com/fda-may-finally-ban-artificial...

    The law will ban six of the nine FDA-approved artificial food dyes –– Red No. 40, Yellow No. 5, Yellow No. 6, Blue No. 1, Blue No. 2 and Green No. 3 –– in public school food and drinks by ...

  6. Tartrazine - Wikipedia

    en.wikipedia.org/wiki/Tartrazine

    In response to concerns about the safety of certain food additives, the UK FSA commissioned a study by researchers at Southampton University of the effect of a mixture of six food dyes (Tartrazine, Allura Red, Ponceau 4R, Quinoline Yellow WS, Sunset Yellow and Carmoisine (dubbed the "Southampton 6")) and sodium benzoate (a preservative) on ...

  7. Isosbestic point - Wikipedia

    en.wikipedia.org/wiki/Isosbestic_point

    When an isosbestic plot is constructed by the superposition of the absorption spectra of two species (whether by using molar absorptivity for the representation, or by using absorbance and keeping the same molar concentration for both species), the isosbestic point corresponds to a wavelength at which these spectra cross each other.

  8. Amaranth (dye) - Wikipedia

    en.wikipedia.org/wiki/Amaranth_(dye)

    Amaranth, FD&C Red No. 2, E123, C.I. Food Red 9, Acid Red 27, Azorubin S, or C.I. 16185 is a modified red azo dye used as a food dye and to color cosmetics. The name was taken from amaranth grain , a plant distinguished by its red color and edible protein-rich seeds.

  9. Electromagnetic absorption by water - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_absorption...

    The absorption intensity is weaker than for the fundamental vibrations, but this is not important as longer path-length cuvettes can be used. The absorption band at 698 nm (14300 cm −1) is a 3rd overtone (n=4). It tails off onto the visible region and is responsible for the intrinsic blue color of water.