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Vermilion is not one specific hue; mercuric sulfides make a range of warm hues, from bright orange-red to a duller reddish-purple that resembles fresh liver. Differences in hue are caused by the size of the ground particles of pigment. Larger crystals produce duller and less orange hues.
Carotenoids are red, orange, or yellow tetraterpenoids. During the process of photosynthesis, they have functions in light-harvesting (as accessory pigments ), in photoprotection (energy dissipation via non-photochemical quenching as well as singlet oxygen scavenging for prevention of photooxidative damage), and also serve as protein structural ...
Bismuth vanadate orange (PO86): non-toxic pigment similar to vermilion. Cadmium pigments. Cadmium orange (PO20): an intermediate between cadmium red and cadmium yellow: cadmium sulfoselenide. Chromium pigments. Chrome orange: a now obscure pigment composed of a mixture of lead chromate and lead(II) oxide (PbCrO 4 •PbO).
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). Charge-transfer complexes tend to have very intense colors for different reasons.
The conversion of chloroplasts to chromoplasts in ripening is a classic example. They are generally found in mature tissues and are derived from preexisting mature plastids. Fruits and flowers are the most common structures for the biosynthesis of carotenoids, although other reactions occur there as well including the synthesis of sugars ...
According to color expert and author, Leatrice Eiseman, one reason the color orange might be associated with Thanksgiving is that it's what's considered a "harvest color." "Orange is one of the ...
However, it is widely considered hard to standardize, and the same vary name could be applied to various tones; russet often has no more specific meaning than ruddy or reddish. [1] The name of this color derives from russet, a coarse cloth made of wool and dyed with woad and madder to give it a subdued grey or reddish-brown shade. By the ...
Vermilion is a very ancient red-orange pigment, made by pulverizing the mineral cinnabar.Its defect is that it is liable to darken with age, and sometimes develops a purple-red surface sheen, as seen in some paintings by Paolo Uccello, including the bridles of the horses depicts in "The Battle of San Romano" .