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Quote:
To make matters yet more confusing, the ounce we use to measure food—the avoirdupois ounce—weighs less, at 28.3 grams, than the 31-gram troy ounce we use to weigh gold and other precious metals. Which raises the question: If we're scaling up a recipe that calls for gold leaf, do we use the avoirdupois ounce or the troy ounce?