Autocatalysis is a reaction in which its product can act as a catalyst. Oxalate oxidation with permanganate in an acid solution is a slow reaction
Mn2+-ions catalyse this reaction. When enough Mn2+-ions are created, the reaction occurs instantly.
Generalic, Eni. "Autocatalysis." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
Glossary
Periodic Table