1. INFLUENCE OF THE THERMAL TREATMENT ON THE COLOUR OF RO٠AL2O3 (R=CO, NI) TYPE SPINEL PIGMENTS PREPARED BY A MODIFIED SOL – GEL METHOD. Authors: ANDREEA ANTON, GHEORGHE BORODI, GABRIEL KATONA, THOMAS DIPPONG, ALEXANDRA AVRAM, LILIANA BIZO, ROXANA DUDRIC, FIRUTA GOGA.