In a food processing industry the stores and warehouses often contain a large range of raw materials. Raw materials such as artificial colouring, spices and essences may be used slowly and may deteriorate on long storage. Others such as wheat or milk powder may be rapidly replaced in the flour and milk industry respectively. Fresh meat is highly perishable and requires good refrigeration where sugar, salt etc. may be very stable and only requires a cool dry condition to remain in excellent condition for a long period. It's not every single raw material which must be subjected to detailed examination and testing at frequent intervals. Those used in insignificant amounts can be omitted from frequent inspection since the cost of inspection will often far outweigh the advantages gained.