The main purpose for application of the color indicators to kimchi packaging is to evaluate easily and reliably the degree of fermentation of commercially packaged kimchi products in a non-destructive way during distribution and retail sale. The TA values of kimchi were hence compared with the TCD values of the indicators as illustrated in Fig. 6.
TCD of each indicator closely correlated with TA, as little influenced by temperature. The TA values give a nearly straight line against the TCD values of the BP type indicator,whereas they formed a concave curve over those of the MR type. Correlation between the TCD of the indicators and the TA of kimchi was obviously proved by a regression analysis.