The coloring performance of the typically synthesized
pigments (Mn 2 and Si 2) was tested for its coloring application
in a substrate material like PMMA. Typically, 10 wt.% pigment
sample was dispersed in PMMA and compressed to a
cylindrical disc (Fig. 8). The color co-ordinates of the test
pieces were measured at different locations. The L*a*b* values
obtained were more or less the same indicating the uniform
distribution of pigment particles in the polymer matrix.