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In the past, purple dye was very expensive to produce, with the first compound used as one, Tyrian purple, being made from the mucus of a family of sea snail found only in the eastern Mediterranean and off Mogador Island near Morocco. To produce small amounts of it, it was required to obtain the mucus of thousands of snails, which was extremely ...
Main jade producing countries. Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments.Jade is often referred to by either of two different silicate mineral names: nephrite (a silicate of calcium and magnesium in the amphibole group of minerals), or jadeite (a silicate of sodium and aluminum in the pyroxene group of minerals). [1]
Red: heat, wildfire; Purple: unnatural (contrasting with natural connotations of green, yellow, blue) Gray/Black: human structures (roads, buildings) Other colors can have intuitive meaning due to their role in Gestalt psychology and other cognitive aspects of the map-reading process.
Prior to World War I the passport was typically a large (11 in × 17 in / 28 cm × 43 cm) diploma, with a large engraved seal of the Department of State at the top, repeated in red wax at the bottom, the bearer's description and signature on the left, and his name on the right above space for data such as "accompanied by his wife," all in ...
Amethyst is a violet variety of quartz.The name comes from the Koine Greek αμέθυστος amethystos from α-a-, "not" and μεθύσκω (Ancient Greek) methysko / μεθώ metho (Modern Greek), "intoxicate", a reference to the belief that the stone protected its owner from drunkenness. [1]
Tyrian purple is a pigment made from the mucus of several species of Murex snail. Production of Tyrian purple for use as a fabric dye began as early as 1200 BC by the Phoenicians, and was continued by the Greeks and Romans until 1453 AD, with the fall of Constantinople.
Fourteen- and eighteen-karat gold alloys with silver alone appear greenish-yellow and are referred to as green gold. Blue gold can be made by alloying with iron, and purple gold can be made by alloying with aluminium. Less commonly, addition of manganese, indium, and other elements can produce more unusual colors of gold for various applications.
Ternary plot of different colors of Ag–Au–Cu alloys. Colored gold is the name given to any gold that has been treated using techniques to change its natural color. Pure gold is slightly reddish yellow in color, [1] but colored gold can come in a variety of different colors by alloying it with different elements.