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Red pigments are materials, usually made from minerals, used to create the red colors in painting and other arts. 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 ...
Naphthol Red (Pigment red 170 or PR170) is an organic pigment extensively used in automotive coatings and painting.. It is produced synthetically by converting p-aminobenzamide into the corresponding diazonium compound followed by coupling with 3-hydroxy-2-naphththoic acid (2-ethoxy)anilide ("Naphtol AS-PH" dye precursor).
Toluidine red is an organic compound with the formula C10H6(OH) (N2C6H3(NO2)CH3). A dark red solid, the compound is classified as a azo dye consisting of a 2-naphthol group linked to a 2-nitro-4-methylphenyl substituent. [3] Toluidine red is a traditional pigment, found in oil paints. [4] Although once popular, it suffers as a pigment owing to ...
Red (RGB), RGB red, or electric red[citation needed] (as opposed to pigment red, shown below) is the brightest possible red that can be reproduced on a computer monitor. This color is an approximation of an orangish red spectral color. It is one of the three primary colors of light in the RGB color model, along with green and blue.
B: Normalized to [0–255] (byte) Venetian red is a light and warm (somewhat unsaturated) pigment that is a darker shade of red. The composition of Venetian red changed over time. Originally it consisted of natural ferric oxide (Fe 2 O 3, partially hydrated) obtained from the red hematite. Modern versions are frequently made with synthetic red ...
History of red. The color red is the longest wavelength of light discernable to the human eye, with a range of between 620 and 750 nanometers. Red was commonly the first color term added to languages after the colors of black and white. As well as this, the color was the first color to be used by humans.
Cerium sulfide red (PR265). Iron oxide pigments. Sanguine, Caput mortuum, Indian red, Venetian red, oxide red (PR102). Red ochre (PR102): anhydrous Fe 2 O 3. Burnt sienna (PBr7): a pigment produced by heating raw sienna. Lead pigments. Minium (pigment): also known as red lead, lead tetroxide, Pb 3 O 4. Mercury pigments.
Rose madder (also known as madder) is a red paint made from the pigment madder lake, a traditional lake pigment extracted from the common madder plant Rubia tinctorum. Madder lake contains two organic red dyes: alizarin and purpurin. [1][2][3] As a paint, it has been described as a fugitive, transparent, nonstaining, mid valued, moderately dull ...
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