[257]

X was started as a product shipped to India in the 18th century, under the control of the British East India Company. It originated to combat the long and harsh conditions of sea voyage in which other products would turn stale or sour. This was done by adding in high quantity a member of the Cannabaceae family of flowering plants, which also gave it a bitter (though acquired) taste.
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India Pale Ale
It is a type of beer with high hops content, and bitter in taste.
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[107]

The origin of term X dates back to 16th century England, when spirits were taxed at different rates depending on their alcohol content. Spirits were tested by soaking a pellet of gunpowder in them and then setting the pellet on fire. Id X, a term commonly seen on alcohol bottles.

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Proof - as a measurement of alcohol strength.
Higher alcoholic beverages would catch fire, which would serve as "proof" & invite higher tax from the authorities.
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