Why should aluminium utensils not be kept in water overnight?

Aluminium utensils should not be kept in water overnight because prolonged exposure to water can cause the aluminium to react with the water and form aluminium oxide. This can lead to the utensils becoming discolored, pitted, or corroded. Additionally, the formation of aluminium oxide can affect the taste and quality of the food cooked in the utensils. It is best to clean aluminium utensils immediately after use and dry them thoroughly to prevent any damage.