Page "Adhesive bandage" Paragraph 7

Special bandages are used by food handlers.

These are waterproof, have strong adhesive so they are less likely to fall off, and are usually bright blue in color so that it is obvious to the wearer if it has fallen off into some food.

They are also detectable by special machines that are used in food manufacturing plants to ensure that food is free from foreign objects before it is shipped to the public.