SSD Chemical solution, short for Super Solution Chemicals, are a class of chemical compounds planned to remove impurities and coatings from currency notes. They comprise a blend of solvents, reagents, and active agents, carefully designed to dissolve the external layer of black ink on the banknotes. While the specific composition of SSD Chemicals is closely guarded by those involved in their production and distribution, it is believed to contain acidic and alkaline components.