3.6. Color change
According to Table 3, The L*, a* and b* values of cake crust and crumb slightly decreased over storage time. Nonetheless, the maximum DE values of all stored samples were 2.77, lower than the detectable threshold (>3) of the human eye (Francis, 1983), indicating that the aged samples were not detectably different from freshly baked sponge cake. At the end of the storage period, the color coordinates of the samples packaged in nylon pouches changed more than those of Knylon.