The process or result of making something slightly sour or giving it a mild acidic taste.
Noun form from Latin 'acidulus' with the suffix '-ation,' indicating an action or process. Emerged in English scientific vocabulary in the 1700s alongside developments in chemistry and food preservation.
Acidulation is why buttermilk makes pancakes fluffy—the acid reacts with baking soda to create lift—and it's been the secret weapon of cooks since before we even understood the chemistry!
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