The activation energies for changes in visual green color and that for the degradation of chlorophyll a in green
peas were found to be similar. On the other hand, the activation energy for chlorophyll b was less than that of
visual color loss. The green color of peas is composed of chlorophyll a responsible for blue-green color of vegetables
and chlorophyll b, giving yellow-green. However, chlorophyll a degrades faster than chlorophyll b as
a function of temperature. Therefore, the ratio of chlorophyll a to chlorophyll b decreases with increasing temperature
and the green color of peas approaches to yellow, gradually. The physical parameters (-a, -a/b and
h) also decrease as a result of the loss of green color intensity.