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The Roman mythographer Julius Pollux, writing in the 2nd century AD, asserted (Onomasticon I, 45–49) that the purple dye was first discovered by the philosopher Heracles of Tyre, or rather, by his dog, whose mouth was stained purple from chewing on snails along the coast at Tyre.
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), the name of the Tyrian purple dye manufactured in classical antiquity from a mucus secreted by the spiny dye-murex snail.
In Malaysia and Laos, a red to purple dye is produced from the root of the Indian mulberry (Morinda tinctoria). In the Philippines, red dye was obtained from noni (Morinda citrifolia) roots, sapang (sappanwood), katuray (Sesbania grandiflora), and narra wood (Pterocarpus spp.), among other plants.
Tyrian purple is a dull purple dye that is secreted by a common Mediterranean snail. It was highly prized in antiquity. In 1909, its structure was shown to be 6,6'-dibromoindigo (red). 6-bromoindigo (purple) is a component as well. It has never been produced on a commercial basis.
Purpura is the color of a dye extracted from a mollusk found on the shores of the city of Tyre in ancient Phoenicia (contemporarily in Lebanon), which color in classical antiquity was a symbol of royalty and political authority because only the very wealthy could afford it, including the Roman Emperors. Therefore, Tyrian purple was also ...
A dye is a colored substance that chemically bonds to the substrate to which it is being applied. This distinguishes dyes from pigments which do not chemically bind to the material they color. Dye is generally applied in an aqueous solution and may require a mordant to improve the fastness of the dye on the fiber.
In Central America, the inhabitants made a dye from a different sea snail, the purpura, found on the coasts of Costa Rica and Nicaragua. The Mayans used this color to dye fabric for religious ceremonies, and the Aztecs used it for paintings of ideograms, where it symbolized royalty.
The combination of 2,5-diaminotoluene with the coupler 3-aminophenol gives a magenta-brown dye, while the combination of 2,5-diaminotoluene with the coupler 1-naphthol gives a purple dye. Yellow-green couplers include resorcinol, 4-chlororesorcinol, and benzodioxoles.
Han purple and Han blue (also called Chinese purple and Chinese blue) are synthetic barium copper silicate pigments developed in China and used in ancient and imperial China from the Western Zhou period (1045–771 BC) until the end of the Han dynasty (circa 220 AD).
At the time, all dyes used for colouring cloth were natural substances, many of which were expensive and labour-intensive to extract—and many lacked stability, or fastness. The colour purple, which had been a mark of aristocracy and prestige since ancient times, was especially expensive and difficult to produce.