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A chemical reaction that is the result of a substance being expose to oxygen. When the oxygen is exposed to certain elements it causes a change to occur, such as when some foods like apples and bananas have their peels removed and are exposed to oxygen, they turn brown.

Mustard is available in several different forms, all originating from the mustard plant. Mustard is first harvested as whole mustard seeds, which can then be ground into powdered or dry mustard.