ɪf ðə fɜːməntˈeɪʃən pˈæθweɪ hɐz tˈeɪkən plˈeɪs, ðə mˈɪkstʃɚɹ ʌv ˈæsɪdz ɪt hɐz pɹədˈuːst wɪl mˌeɪk ðə səlˈuːʃən vˈɛɹi ɐsˈɪdɪk ænd kˈɔːz ɐ ɹˈɛd kˈʌlɚ tʃˈeɪndʒ.
If the fermentation pathway has taken place, the mixture of acids it has produced will make the solution very acidic and cause a red colour change.