tə mˌeɪk pjˈʊɹ sˈiːsiəm, ˈoːɹz ʌv sˈiːsiəm ænd ɹuːbˈɪdiəm ɑːɹ kɹˈʌʃt ænd hˈiːɾᵻd tə sˈɪkshˈʌndɹɪd fˈɪfti dᵻɡɹˈiːz sˈiː wɪð sˈoʊdiəm mˈɛɾəl, dʒˈɛnɚɹˌeɪɾɪŋ ɐn ˈælɔɪ ðæt kæn ðˈɛn biː sˈɛpɚɹˌeɪɾᵻd vˈaɪəɹ ɐ fɹˈækʃənəl dɪstɪlˈeɪʃən tɛknˈiːk.
To make pure caesium, ores of caesium and rubidium are crushed and heated to 650 °C with sodium metal, generating an alloy that can then be separated via a fractional distillation technique.