Alkahest is the theoretical universal solvent in alchemy, believed to dissolve any material, including the Philosopher's Stone itself. This hypothetical substance was seen as the key to breaking down matter into its purest form, making it essential for both material and spiritual transformation.
The term "Alkahest" is attributed to the Swiss alchemist Paracelsus, who introduced it in the 16th century. Although the universal solvent was never discovered, the pursuit of Alkahest contributed to advances in chemistry, particularly in understanding solubility and chemical reactions.