Color attributes of black rice samples were measured by Colorimeter
(CR-410, Konica Minolta, Japan). The color was expressed in
L⁄
a⁄
b⁄
, where the L⁄ represents lightness (L⁄ = 0 yields black and
L⁄ = 100 denotes white), the a⁄ expresses red (+) or green (),
and the b⁄ indicates yellow (+) or blue (). L⁄
, a⁄ and b⁄ parameters
were measured against a white background plate which were
directly obtained from the apparatus.