Skin color of the fruit was measured using a color
differential meter (ZE–2000, Nippon Denshoku, Japan)
to determined Hunter Lab’s L* value (lightness or brightness),
a* value (redness or greenness), and b* value
(yellowness or blueness) by averaging four measurements
of the fruit equator. The color of flesh was determined
on the surface of flesh (0.5 cm beneath the skin).
Measurements were taken for three samples and the
average of L*, a*, and b* values were obtained. The colorimeter
was warmed up for 30 min and calibrated with
a white standard tile: L*=95.87, a*=–0.86 and b*=2.47.
Measurement of hardness