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 near the center of the line of purples, but most people associate the term "purple" with a somewhat bluer tone, such as is displayed by the color "electric purple" (a color also directly on the line of purples), shown below.

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Cooksey CJ (2001). "Tyrian purple: 6,6'-dibromoindigo and related compounds". Molecules. 6 (9): 736–769. doi: 10.3390/60900736. PMC 6236399. Tekhelet– A blue dye mentioned in the Hebrew Bible and prized by ancient Mediterranean civilizations Perkin’s purple, otherwise known as aniline purple, or mauveine, was the first synthetic dye. The synthesis transformed purple’s elite status, and probably saved the lives of a great many snails.

A Lost Purple Pigment, Where Quantum Physics and the Terracotta Warriors Collide". 18 December 2014. a b c St. Clair, Kassia (2016). The Secret Lives of Colour. London: John Murray. p.159. ISBN 9781473630819. OCLC 936144129.

Dye For: A history of natural and synthetic dyes To Dye For: A history of natural and synthetic dyes

Quinacridone violet, one of a modern synthetic organic family of colors, was discovered in 1896 but not marketed until 1955. It is sold today under a number of brand names. Perry G (1810–1811). Arcana, or, The museum of natural history …. London, England: James Stratford. p.Plate XXIII: Genus: Triplex. Main article: Tyrian purple Byzantine Emperor Justinian I clad in Tyrian purple, 6th-century mosaic at Basilica of San Vitale

True Tyrian purple, like most high- chroma pigments, cannot be accurately rendered on a standard RGB computer monitor. Ancient reports are also not entirely consistent, but these swatches give a rough indication of the likely range in which it appeared:

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In some textbooks of color theory, and depending on the geographical-cultural origin of the author, a "purple" is defined as any non-spectral color between violet and red (excluding violet and red themselves). [47] In that case, the spectral colors violet and indigo would not be shades of purple. For other speakers of English, these colors are shades of purple. Purple Mountain in Wyoming (el. 8,392 feet (2,558m)) is a mountain peak in the southern section of the Gallatin Range in Yellowstone National Park.The most well-known shellfish dye was the Tyrian purple, royal purple or imperial purple as it was called, which came from sea snails in the Eastern Mediterranean in the ancient city of Tyre. This dye was very special for all the civilisations around the Mediterranean and its use spanned whole centuries. It was the most expensive dye in the whole of ancient world, as the colour it produced was very bright and colourfast. Because of its properties, its use was restricted for royals, members of the royal family, and senior public officers and priests. The lower band of the flag of the second Spanish republic (1931–39) was colored a tone of purple, to represent the common people as opposed to the red of the Spanish monarchy, unlike other nations of Europe where purple represented royalty and red represented the common people. [96] Definition of the Tyrian purple". World History Encyclopedia. Archived from the original on 24 July 2016. a b c d e f g Carlson, Kathie; Flanagin, Michael N.; Martin, Kathleen; Martin, Mary E.; Mendelsohn, John; Rodgers, Priscilla Young; Ronnberg, Ami; Salman, Sherry; Wesley, Deborah A.; etal. (Authors) (2010). Arm, Karen; Ueda, Kako; Thulin, Anne; Langerak, Allison; Kiley, Timothy Gus; Wolff, Mary (eds.). The Book of Symbols: Reflections on Archetypal Images. Köln: Taschen. p.654. ISBN 978-3-8365-1448-4.