What is an indicator of rancidity in peanuts?

An indicator of rancidity in peanuts is a sour or off odor when opened. Rancidity occurs when the fats in peanuts begin to break down, usually due to exposure to air, light, or heat. This breakdown leads to the production of volatile compounds that can produce undesirable smells. When peanuts are rancid, the off odor is typically one of the first noticeable signs, informing inspectors of potential spoilage.

In contrast, a bitter taste might be present in stale or poorly stored peanuts, but it is not as definitive as the off odor for indicating rancidity. The texture of peanuts should be consistent; a smooth texture does not provide any indication of rancidity. Additionally, bright color might suggest freshness, but it does not relate directly to the presence of rancidity. Thus, the presence of a sour or off odor serves as a clear warning signal of rancidity in peanuts, making it the correct answer in this context.