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Nascent Drama

The word 'purple' comes from the Old English word purpul which originates from the Latin purpura.
 
This in turn is derived from the Koine Greek πορφύρα (porphyra), name of the dye manufactured in Classical antiquity from the mucus-secretion of the hypobranchial gland of a marine snail known as the Murex brandaris or the spiny dye-murex.[4]
 
The first recorded use of the word 'purple' in English was in the year AD 975.[5]
 
The color regarded as the standard for purple has changed over the years, from Tyrian Purple in ancient times to Electric Purple today.
 
Violet is a spectral color (approximately 420–380nm), of a shorter wavelength than blue, while purple is a combination of red and blue or violet light.
 
The purples are colors that are not spectral colors – purples are extra-spectral colors. In fact, purple was not present on Newton's color wheel (which went directly from violet to red), though it is present on modern ones, between red and violet.
 
There is no such thing as the "wavelength of purple light"; it only exists as a combination.
 
Violet
— Color coordinates —
Hex triplet #8B00FF
B (r, g, b) (139, 0, 255)
HSV (h, s, v) (273°, 100%, 100%)
Source BF2S Color Guide
B: Normalized to [0–255] (byte)
 
On the CIE xy chromaticity diagram, violet is on the curved edge in the lower left, while purples are the straight line connecting the extreme colors red and violet.
 
One interesting psychophysical feature of the two colors that can be used to separate them is their appearance with increase of light intensity.
 
Violet, as light intensity increases, appears to take on a far more blue hue as a result of what is known as the Bezold-Brücke shift.
 
The same increase in blueness is not noted in purples.
 
Violet cannot be reproduced by a Red-Green-Blue (RGB) color system, and must be simulated by a mixture of red and blue (purple).
 
The shade of violet simulated in the color box above is just over halfway between magenta and blue on the color wheel.
 
On a chromaticity diagram, the straight line connecting the extreme spectral colors (red and violet) is known as the 'line of purples' (or 'purple boundary'); it represents one limit of human color perception.
 
The color magenta used in the CMYK printing process is on the line of purples, but most people associate the term "purple" with a somewhat bluer shade.
 
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