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Ponceau (17th century French for "poppy-coloured") is the generic name for a family of azo dyes. Ponceau 4R is a strawberry red azo dye which can be used in a variety of food products, and is usually synthesized from aromatic hydrocarbons ; it is stable to light, heat, and acid but fades in the presence of ascorbic acid.
Synthetic colorants are those created in a laboratory or industrial setting. The production and improvement of colorants was a driver of the early synthetic chemical industry, in fact many of today's largest chemical producers started as dye-works in the late 19th or early 20th centuries, including Bayer AG (1863). [ 2 ]
In 1824, the Societé pour l'Encouragement d'Industrie offered a prize for the artificial production of the precious color. Processes were devised independently by Jean Baptiste Guimet (1826) and Christian Gmelin (1828); while Guimet kept his process a secret, Gmelin published his, and thus became the originator of the French synthetic ...
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Printable Crossword Puzzle: September 2017 We've used the names of Snow White's diminutive friends as clues in this crossword. How they are defined is up to you to determine. Here's a tip: If you ...
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