(g) Color evaluation: For color determinations, 30 g of sam- ple were triturated and measured with a Minolta Chroma Meter (CM – 3600d, Minolta, and Ramsey, NJ). The colorimeter was calibrated against standard white and black tiles. Measurements were performed in the CIE L a b system, using an illuminate C. Light- ness value, L, indicates how dark/light the sample is (varying from 0 – black to 100 – white), a is a measure of greenness/redness (varying from