The color of the synthesized pigments is numerically
expressed in terms of the color co-ordinates (Table 1). The
lightness (L*) increases as the praseodymium content decreases
and Mn and Si content increasesin both the set of compositions.
The redness (a*) of Mn co-substituted Ce1xPrxO2 compounds
increases with increase in concentration of Mn, with low b*
values and hence the samples exhibit more dark brown color.
For Si co-substituted Ce0.95Pr0.05O2 compounds both a* and b*