Gamsol is a highly purified form of odorless mineral spirit, distilled at high temperature and purified of all aromatic components. The purification process accounts for the price difference. These and other solvents such as naphtha, kerosene, toluene, and xylene are distilled from petroleum.
First petroleum starts boiling.
Then at different temperatures, different solvents are distilled. The higher the boiling temperature, the less volatile the solvent. The less volatile, the safer. After gross separation into MS and OMS, OMS solvent can be further purified. Gamsol is so purified that all impurities and aromatic components have been removed.