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Quinacridone is an organic compound used as a pigment. Numerous derivatives constitute the quinacridone pigment family, which finds extensive use in industrial colorant applications such as robust outdoor paints, inkjet printer ink , tattoo inks , artists' watercolor paints , and color laser printer toner .
Alizarin crimson is a shade of red that is biased slightly more towards purple than towards orange on the color wheel and has a blue undertone. It is named after the organic dye alizarin , found in the madder plant, and the related synthetic lake pigment alizarin crimson (PR83 in the Color Index).
Purpurin fluoresces yellow to red under ultraviolet light, while synthetic alizarin slightly shows violet. [12] Alizarin was discovered before purpurin, by heating the ground madder with acid and potash. A yellow vapor crystallized into bright red needles: alizarin. This alizarin concentrate comprises only 1% of the madder root.
Alizarin is the main ingredient for the manufacture of the madder lake pigments known to painters as rose madder and alizarin crimson. Alizarin in the most common usage of the term has a deep red color, but the term is also part of the name for several related non-red dyes, such as Alizarine Cyanine Green and Alizarine Brilliant Blue.
The color of red and other pigments is determined by the way it absorbs certain parts of the spectrum of visible light and reflects the others. The brilliant opaque red of vermillion, for example, results because vermillion reflects the major part of red light, but absorbs the blue, green and yellow parts of white light. [1]
Alizarin. One of the most important anthraquinone dyes of herbal origin is alizarin, which is extracted from the dyer's madder (Rubia tinctorum). Alizarin is the eponym for a number of structurally related dyes that use alizarin dyes (sometimes synonymous with anthraquinone dyes). It was the first natural dye for which an industrial synthesis ...
Copperas is the dyer's name for ferrous sulfate, an iron mordant used to sadden or reduce the saturation of colors. [4] [13] crimson Crimson is a deep red dye or color derived from the word kermes. [14] [15] [16] crottle
Similarly, color is due to the energy absorbed by the compound, when an electron transitions from the HOMO to the LUMO. Lycopene is a classic example of a compound with extensive conjugation (11 conjugated double bonds), giving rise to an intense red color (lycopene is responsible for the color of tomatoes).
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