Art Spectrum Medium No. 2 is slower drying than Medium No. 1 as it contains more oil, and is 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.