In order to overcome these technological and colourimetric limits, Siggel and Jansen [6] designed a solid solution
of zirconium titanate-stannate, that was doped with several combinations of a chromophore (i.e. a transition metal ion) and a counterion (i.e. an ion added to ensure the charge neutrality of the lattice). This solid solution is isostructural with srilankite and presents the same disordered cation distribution of zirconium titanate pigments [2,6,7]; nevertheless, it is able to develop more saturated colours. In particular, the co-doping with vanadium plus a trivalent counterion (i.e. Al, In or Y) gives rise to an intense and brilliant yellow coloration [6]. Despite the prospect of industrial application – consequent to a claimed thermal resistance up to 1200 8C – no detailed technological characterisation was carried out, nor colouring mechanism investigated to any extent.