Eco-friendly Solvent-Free Fluid Medium gives oil paints a more fluid consistency and moderately speeds drying time. Handcrafted at the company's wind-powered factory in Portland, Oregon, the medium has been developed to support a broad range of painting techniques with minimal compromise in terms of color, dry time, and mark making. They are non-toxic, contain no Gamsol or petroleum distillates, and clean up with soap and water.