Solvents are used to dilute colours and to clean brushes and equipment. English Distilled Turpentine makes a viscous mixture which evaporates slowly. It is the most hazardous and strongest smelling solvent, and can deteriorate on storage. Artists’ White [or mineral] Spirit (not available in the USA) makes a watery mixture which evaporates quickly and is less hazardous. It does not deteriorate on storage. Sansodor™ makes a viscous mixture, which evaporates slowly, and is the least hazardous. It does not deteriorate on storage, has a minimal odour and can be travelled with safely.