Pressed from flax seeds in Canada without the use of heat or chemicals of any kind, Cold Pressed Linseed Oil by Gamblin is the most traditional oil offered by Gamblin. By adding this oil to oil colors, the artist will thin colors and increase their brilliance and transparency. While Cold Pressed Linseed Oil slows drying time, it also increases the tendency of white and light colors to yellow over time. Gamblin suggests using Cold Pressed Linseed Oil sparingly or to mix with an equal amount of Gamsol to create the traditional slow-drying, low-viscosity painting medium.