A CIELAB and CIELCh scale was used and the color
parameters measured were: L* ¼ lightness (0 ¼ black and
100 ¼ white), a* ¼ the red-green color (80 to zero ¼ green, zero
to þ100 ¼ red) and b* ¼ the yellow-blue color (100 to zero ¼ blue,
zero to þ 70 ¼ yellow).