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