Cold Compress bandage uses an endothermic chemical reaction to cool an injured area

The Cold Compress adhesive bandage looks like a round BandAid but it features a packet of two chemicals on its small protrusion. To activate the cooling action, the user will have to press the bulge to pop the individual chambers and mix two chemicals.

The cooling action comes from the mixing of ammonium nitrate with water. The same chemicals are used in other instant cool patches usually included in first aid kits. Applying a cold pack to the skin, especially to a site of bleeding, constricts the blood vessels – tighter blood vessels mean less bleeding. Cooling the site of injury will also decrease bruising and alleviate pain.

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