Pure rubidium and caesium metals are produced by reducing their chlorides with calcium metal at 750 °C and low pressure.
pjˈʊɹ ɹuːbˈɪdiəm ænd sˈiːsiəm mˈɛɾəlz ɑːɹ pɹədˈuːst baɪ ɹᵻdˈuːsɪŋ ðɛɹ klˈoːɹaɪdz wɪð kˈælsiəm mˈɛɾəl æt sˈɛvənhˈʌndɹɪd fˈɪfti dᵻɡɹˈiːz sˈiː ænd lˈoʊ pɹˈɛʃɚ.