It’s just a pyrotechnic mix in a can. A firework in the shape of a grenade, if you’d like. An oxidizer (like potassium nitrate) and a metal like aluminum in powder form. Reacts violently, producing huge amounts of sound and light. Enough to cause you to be stunned to the ground through sheer sensory overload, without hurting you. Although you’re not exactly safe from a ruptured eardrum.
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