Titanium yellow
Titanium yellow is a yellow pigment with the chemical composition NiO·Sb2O3·20TiO2. It is considered a complex inorganic color pigment (CICP), formerly known as a mixed phase metal oxide. The pigment has a rutile crystal lattice, with 2–5% of titanium ions replaced with nickel(II) and 9–12% of them replaced with antimony(III).
Read on Wikipedia