The pyrochlore pigment in the glaze, however, was
decolorized when fired at 1300 C. Estrada et al.8 studied
a vanadium cordierite pigment. This pigment was
synthesised by sol-gel processing. With addition of
vanadium pentoxide, a small solid solution region with
the high temperature cordierite structure was detected.
The composition range of the cordierite solid solution
was found to be 4 wt.% chromophore content. Volatilisation
of vanadium occurred with increasing temperature.
The hue of these compositions was in the yellow
region.