Art Spectrum Medium No. 2 is a fat medium that works on improving fluidity and increasing gloss. It resists yellowing and is ideally suited for glazes. It contains more oil than Medium No.1. and should be mixed with the oil paint as the layers of painting develop. It has some of the properties of a glazing medium but it is preferable to use Art Spectrum 24-hour Glazing Medium if very thin veils of colour are desired.