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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. As pigments, the quinacridones are insoluble.
A pigment is a powder used to add color or change visual appearance. Pigments are completely or nearly insoluble and chemically unreactive in ... quinacridone ...
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.
High purity titanium dioxide and zinc oxide were produced for the first time on an industrial scale and introduced synthetic white pigments. [5] The first insoluble organic pigments, the red naphthols, containing neither acid nor basic groups, were produced and sold. [21] Furthermore, the quality of the new dyes increased.
Like most phenols, THBQ is acidic and easily loses the four hydrogen ions from the hydroxyl groups, yielding anions such as C 6 H 2 O 2− 6 and C 6 O 4− 6.. The calcium salt Ca 2 C 6 O 6 is the dark purple pigment produced from inositol by Chromohalobacter beijerinckii in the fermentation of salt beans, already noted by T. Hof in 1935.
Diethylsuccinylsuccinate is valued as a precursor to the quinacridone pigments. For example, it reacts with two equiv of anilines to give the diamines [CH 2 C(N(H)Ar)=C(CO 2 Et)] 2, which undergoes cyclization upon treatment with acid to give dihydroquinacridone. [3] [4] [5]
Many natural and artificial coloring substances (dyes and pigments) are quinone derivatives, for instance lawsone is the active dye compound in henna. They are second only to azo dyes in importance as dyestuffs, with particular emphasis on blue colors.
Alizarin Red S, as sold for use as a histologic stain. Alizarin Red S is used in histology and histopathology to stain, or locate calcium deposits in tissues. [1] [3] [4] In the presence of calcium, Alizarin Red S, binds to the calcium to form a Lake pigment that is orange to red in color. [4]
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