In chemistry laboratories, one of the most striking demonstrations of spontaneous combustion involves mixing solid potassium permanganate with liquid glycerin. Potassium permanganate is a dark purple crystalline salt known as a powerful oxidizing agent. Glycerin, also called glycerol, is a thick, sweet tasting organic liquid commonly found in soaps and food products.
When a few drops of pure glycerin are placed onto a small pile of crushed potassium permanganate crystals, nothing seems to happen at first. This quiet period is called an induction phase. Beneath the surface, an exothermic oxidation reduction reaction is quietly gaining momentum, slowly heating the mixture.
Within thirty to sixty seconds, the temperature climbs drastically until thick white clouds of smoke billow from the powder. The intense heat reaches several hundred degrees Celsius, which is well above the ignition point of glycerin. Suddenly, the pile erupts into a bright purple flame, colored distinctly by the potassium ions in the salt.
This simple demonstration shows how chemical energy can convert rapidly into intense thermal and light energy without any spark or external flame.
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Disclaimer: This video is for informational and educational purposes only. The information comes from public educational sources and images are illustrative.
