When used in edible oil refining, clay minerals act as a filter for impurities and color bodies. The clay is considered an adsorbent, which clings to the impurities in unfiltered oil. The clay adsorbs by forming chemical bonds with the oil to filter the unwanted impurities. This process results in a clear and pure oil product.
Clays are used as clarification agents in the productions of drinks such as beer, wine, mineral water, and honey. Bentonite is used in the production of foods such as candy bars and yogurt.