ˈʌðɚɹ ˌɛntɚɹˌɑːbɐktˈɪɹiə sˈʌtʃ ɐz ˈiː. kˈoʊli wɪl fɜːmˈɛnt ðə lˈæktoʊs pɹˈɛzənt ɪnðə mˈiːdiəm tʊ ɐn ɛkstˈɛnt ðæt wɪl pɹɪvˈɛnt pˈiː ˈeɪtʃ ɹᵻvˈɜːʒən baɪ dᵻkˌɑːɹbəksɪlˈeɪʃən ænd ɐsˈɪdᵻfˌaɪ ðə mˈiːdiəm tˈɜːnɪŋ ɪt jˈɛloʊ.
Other Enterobacteria such as E. coli will ferment the lactose present in the medium to an extent that will prevent pH reversion by decarboxylation and acidify the medium turning it yellow.