Perkin's flask

LITIn 1856 William Henry Perkin, then 18, was trying to make quinine. He oxidised aniline with potassium dichromate, got a black sludge, and washed the flask with alcohol, which came out purple. He patented the dye ("aniline purple", later mauve or mauveine) and opened a dyeworks at Greenford the next year. Between 1859 and 1861 mauve was the fashion; Punch joked about "the Mauve Measles".

LITPotassium dichromate is the orange in the flask. INVENTEDThat gives the nesting here: an orange oxidant core, a purple product shell, and the black tar of the failed quinine run around both. The crowd below is an engraving of London in 1859. Mauve spreads hat to hat as a contagion (a MODEL with made-up rates, not data on fashion).

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