Mace Pepper Foam

contain oleoresin capsicum—a naturally occurring substance derived from hot peppers. OC Pepper causes an intense burning sensation to the skin, eyes and throat upon contact. Some formulations also contain UV dye to invisibly mark an assailant which may aid in identification. 

Mace 10% Pepper Foam covers an assailant's face, making it difficult to see. When the attacker attempts to wipe away the foam, the pepper is ground into the face and eyes.