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The modern English word purple comes from the Old English purpul, which derives from Latin purpura, which, in turn, derives from the Greek πορφύρα (porphura), [6] the name of the Tyrian purple dye manufactured in classical antiquity from a mucus secreted by the spiny dye-murex snail.
Flags of white, red and blue stripes (bands) are closely associated with independence and the French Revolution. It can often signal the relationships of some nations with other nations (for instance, the flag of the Netherlands and flags of its former colonies).
In the Munsell color system, this color at its maximum chroma of 12 is called Red-Purple, or more specifically Munsell 5RP. Artists' pigments and colored pencils labeled as purple are typically colored the red-violet color. On an RYB color wheel, the so-called red-violet color is the color between red and violet.
Lamium purpureum grows with square stems to 5–20 cm [3] (rarely 30 cm) in height. The leaves have fine hairs, are green at the bottom and shade to purplish at the top; they are 2–4 cm long and broad, with a 1–2 cm petiole (leaf stalk), and wavy to serrated margins.
The most common synthetic food coloring today is Allura Red AC, a red azo dye that goes by several names including: Allura Red, Food Red 17, C.I. 16035, FD&C Red 40, [25] [26] It was originally manufactured from coal tar, but now is mostly made from petroleum. [27] In Europe, Allura Red AC is not recommended for consumption by children.
The irises of human eyes exhibit a wide spectrum of colours. 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.
Purple is one of the least used colors in vexillology and heraldry.Currently, the color appears in only five national flags: that of Dominica, Spain, El Salvador, Nicaragua, and Mexico, and one co-official national flag, the Wiphala (co-official national flag of Bolivia).
The lumen (symbol: lm) is the unit of luminous flux, a measure of the perceived power of visible light emitted by a source, in the International System of Units (SI). ). Luminous flux differs from power (radiant flux) in that radiant flux includes all electromagnetic waves emitted, while luminous flux is weighted according to a model (a "luminosity function") of the human eye's sensitivity to ...
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