It's based off the article Potassium Carbonate as a Salt for Deep Eutectic Solvents.

This is an easy-to-make ionic liquid or deep eutectic solvent that I've made. Basically it's Epsom salt (magnesium sulfate heptahydrate) and glycerin/glycerol in a 1:3 molar ratio. It's based off the article Potassium Carbonate as a Salt for Deep Eutectic Solvents.