How to make inorganic gray pigment?

Antimony tin gray is solid soluble in SnO2, so it is gray.Sb2O4 is produced by heating Sb2O3 in the compound material during the preparation of the color material.that means Sb³⁺Sb⁵⁺O4 is a composite oxide, among which the coordination number of Sb³⁺ and Sb⁵⁺ is 6.Sb³⁺ in Sb2O4 replaces Sn⁴⁺ in SnO2 to form a substitutional solid solution.Its replacement equation is: Sb³⁺ + Sb⁵⁺ ⇋2Sn⁴⁺.It's a beautiful blue-gray color.If the vanadium is dissolved in a solid solution, SnO2[Sb，V] is grayish in color.In addition, Zr-Si-Co-Ni zirconium lime is also present in the system. Among them if add person Co²⁺, it’s gray blue tone.

The grey system color has antimony tin gray and zircon type cobalt nickel gray. Antimony tin grey is a kind of traditional grey material, which has a long history of use and looser conditions, and can present pure silvery grey color in the glaze. Cobalt and nickel ash is a newly developed gray tone, which is gray tone due to cobalt and nickel solid solution in zircon lattice. The color itself is light brown gray, in the glaze is a reddish silvery gray tone.