"Used acid say" NYT crossword answer is:ETCHED (6 letters length)
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The used acid crossword clue from the New York Times on October 11, 2023 is "Sour Substance". This clue is referring to the chemical compound known as acid, which is a sour-tasting substance that is found in many everyday items such as vinegar, lemon juice, and battery acid. Acids are also used in many industrial processes, such as metal etching and food preservation.