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Amethyst is a purple variety of quartz (SiO 2) and owes its violet color to irradiation, impurities of iron (Fe 3+) and in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. The irradiation causes the iron Fe 3+
Eye color. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye 's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. [3] : 9. In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of ...
A RYB color wheel with tertiary colors described under the modern definition. RYB is a subtractive mixing color model, used to estimate the mixing of pigments (e.g. paint) in traditional color theory, with primary colors red, yellow, and blue. The secondary colors are green, purple, and orange as demonstrated here: red.
Miss Celie's Blues. " Miss Celie's Blues ", also known as "Sister", is a song from the Steven Spielberg film The Color Purple (1985), with music by Quincy Jones and Rod Temperton and lyrics by the two of them with Lionel Richie, performed by Táta Vega. The song was nominated for an Academy Award for Best Music, Original Song in 1986.
The Color Purple is a 2023 American musical period drama film directed by Blitz Bazawule. Marcus Gardley 's screenplay is based on the stage musical of the same name, which in turn is based on the 1982 novel of the same name by Alice Walker. It is the second film adaptation of the novel, following the 1985 film directed by Steven Spielberg and ...
A diagram demonstrating additive color with RGB. The RGB color model is an additive color model [1] in which the red, green and blue primary colors of light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three additive primary colors, red, green, and blue.
Purple urine bag syndrome ( PUBS) is a medical syndrome where purple discoloration of urine occurs in people with urinary catheters and co-existent urinary tract infection. Bacteria in the urine produce the enzyme indoxyl sulfatase. This converts indoxyl sulfate in the urine into the red and blue colored compounds indirubin and indigo. [1]
Anthocyanin-rich plants Anthocyanins give these pansies their dark purple pigmentation Coloration. In flowers, the coloration that is provided by anthocyanin accumulation may attract a wide variety of animal pollinators, while in fruits, the same coloration may aid in seed dispersal by attracting herbivorous animals to the potentially-edible fruits bearing these red, blue, or purple colors.