In the "Colloid mill" method, a rotor moves at high speed within a stator by adding bitumen and a water-emulsifier mixture.
ɪnðə "kˈɑːlɔɪd mˈɪl" mˈɛθəd, ɐ ɹˈoʊɾɚ mˈuːvz æt hˈaɪ spˈiːd wɪðˌɪn ɐ stˈeɪɾɚ baɪ ˈædɪŋ bɪtˈuːmɛn ænd ɐ wˈɔːɾɚɹɪmˈʌlsɪfˌaɪɚ mˈɪkstʃɚ.