In this investigation a number of dyes have been prepared by coupling guaiacol with various diazotized amines. Some of the physical properties of these compounds have determined. In all cases the sodium salt of the dye was obtained. Four dyes were obtained as the free bases. The free bases were obtained as a viscous tarry substance, which resisted attempts at recrystallization in most cases. In an attempt to secure a more readily recrystallizable modification of the dyes, the acetyl derivatives of a few were tried, but in every ease an oil was obtained.