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Violet is closely associated with purple. In optics, violet is a spectral color (referring to the color of different single wavelengths of light), whereas purple is the color of various combinations of red and blue (or violet) light, [5] [6] some of which humans perceive as similar to violet.
Argaman (Tyrian purple) was another luxurious ancient dye, and was symbolic of royal power. Tola'at shani ("scarlet") was considered a striking and lively color, and was used in priestly garments and other ritual items, but could also symbolize sin. White (as in linen or wool garments) symbolized moral purity.