For injuries not serious enough to require a full-size bandage plaster protects the cut from friction, germs, damage, or dirt. Thus, the healing process of the body is less disturbed.
Plaster must be at the same time porous, to the skin to breathe, absorbent, usually having an absorbent pad with antiseptic, and waterproof, not to let out the blood.
Special blue 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.
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