Potassium permanganate [KMnO4]
Potassium permanganate (KMnO4) is a manganese salt forming purplish crystals that give deep purple solutions.
Characteristics
- Manganese is in the +7 oxidation state.
- A strong oxidiser; when reduced it forms brown manganese dioxide.
- Very toxic to aquatic organisms.
- Cited in a few recipes in agroecological literature as an oxidising agent.
Role in the preparation: Acts as an oxidising agent in the few traditional recipes that mention it.
Caution: Harmful if swallowed and irritant: wear gloves and goggles, store away from organic matter and acids, do not release it into water and check local regulations before any use.
Sources: Wikipedia (offline copy, SolarSPELL) - Potassium permanganate
Documentary information: this is neither a recommendation for use nor a plant-protection or veterinary claim. Check your country's regulations before any use.