Process for making greencake

Claim 1

IN A PROCESS FOR MAKING A PIGMENT CONSISTING ESSENTIALLY OF AT LEAST ONE COBALT COLORANT COMPOUND SELECTED FROM THE GROUP CONSISTING OF COBALT TITANATE AND COBALT ALUMINATE, THE EQUIVALENT COBALTOUS OXIDE IN THE RESULTING PIGMENT BEING BETWEEN ABOUT 0.9% AND THE STOLCHIMETRIC AMOUNT REQUIRED FOR FORMING SAID COBALT COLORANT COMPOUNDS PRESENT, FROM A MIXTURE COMPRISING COBALTOUS COBALT-PROVIDING REACTANT MATERIAL AND AT LEAST ONE CORRESPONDING REACTANT SELECTED FROM THE GROUP CONSISTING OF TITANIA-PROVIDING MATERIAL AND ALUMINA-PROVIDING MATERIAL WHEREIN SAID MIXTURE IS CALCINED TO YIELD THE PIGMENT, THE IMPROVEMENT WHICH COMPRISES: ADDING FINELY DIVIDED ELEMENTAL COBALT OF PARTICLE THICKNESS NOT GREATER THAN 10 MILS TO SAID MIXTURE AS AT LEAST A FRACTION OF SAID COBALTOUS COBALT-PROVIDING REACTANT MATERIAL; AND CALCINING THE MIXTURE FOR 1 TO 24 HOURS AT 700-1100*C. IN THE PRESENCE OF MOLECULAR OXYGEN.