Nebesky, Esselen,
Mcconnel, and Feller (1949) reported that oxygen and temperature
were the most specific accelerating agents in the degradation
of blueberry pigments. Hence the blueberries dried at higher
temperature (e.g., 107 C) may have greater loss of reddish anthocyanin
pigments and appear darker (more bluish) compared to
berries dried at lower temperature.