Heat-Resistant Ceramic Pigments on the Base of Waste Vanadium Catalyst and Alumina

Table 4

Color characteristics of the obtained ceramic pigments and dyes (𝑇_sint.=1200°C).

Sample number	Pigment colour parameters			Dye colour parameters
	𝐿^∗	𝑎^∗	𝑏^∗	𝐿^∗	𝑎^∗	𝑏^∗
M1 (Co^2+)	48.0	0.0	−16.0	58.0	0.0	−15.0
M3 (Co^2+)	38.0	0.0	−19.0	44.0	0.0	−10.0
M4 (Ni^2+)	53.0	−6.0	6.1	66.0	−1.0	11.0
M6 (Ni^2+)	46.0	−6.0	4.7	56.0	−4.0	9.4
M8 (Cr^3+)	44.0	2.4	2.8	54.0	10.0	19.0
M9 (Fe^3+)	47.0	4.3	9.9	57.0	11.0	15.0
M10 (Fe^3+)	38.0	7.6	7.1	54.0	5.2	18.0