A medium fat. It is slower drying than Art Spectrum^® Medium No. 1, as it contains more oil, and used as the next fattest medium in the sequence of painting €˜fat over lean€™. It should be mixed with the oil paint as the layers of painting develop in the fat over lean sequence. If desired Art Spectrum^® Medium No.1 may be gradually fattened by adding increasing amounts of Medium No.2. Art Spectrum^® Medium No.2 has some of the properties of a glazing medium, but it is preferable to use Art Spectrum^® Liquol if very thin veils of colour are desired.