Milk powders are immensely more stable than fresh milk but protection from moisture,
oxygen, light and heat is needed in order to maintain their quality and shelf life. Milk
powders readily take up moisture from the air, leading to a rapid loss of quality and caking or
lumping. The fat in WMPs can react with oxygen in the air to give off-flavours, especially at
higher storage temperatures (> 30C) typical of the tropics.