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IPA: the hot maturation experiment

In any modern account of the history of India Pale Ale, you’ll generally find a declaration that the casks of well-hopped beer sent out to India by ship via the Cape of Good Hope in the late 18th century matured and developed quickly in a way that the same beer kept at home in Britain did not. It was this accelerated maturation in a short time (three to four months or so) caused by travelling through the warm waters and hot climate of the central Atlantic and the Indian Ocean as the sailing ships twice crossed the equator that gave IPA the character that was so much appreciated by expatriate Britons in Bombay, Madras and Calcutta, supposedly. But is this actually true?

You’ll be pushed to find contemporary (that is, 18th and 19th century) confirmation of the “hot maturation” theory for IPA’s popularity in India. Contemporary writers talked about the enthusiasm with which IPA was consumed in the Indian heat, but never seemed to mention whether it was altered to the good on its way east.

Certainly “hot maturation” can’t be the cause for any popularity for IPA back in Britain, since if the beer did go through any accelerated changes on the voyage to the sub-continent, this couldn’t be happening to the beer stored in chilly cellars back home. Are current writers on beer guilty of assumptionism (otherwise known as “you’re making this up”), the crime of assuming without evidence that situation A must surely have brought about result B – that beer on board a sailing ship travelling through the tropics must surely have matured quickly?

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