ɪɾ ɪz pɹədˈuːst baɪ ðə ɹɪˈækʃən ʌv θˈæliəm wɪð ˈɑːksɪdʒən ɔːɹ hˈaɪdɹədʒən pəɹˈɑːksaɪd ɪn ɐn ˈælkəlˌaɪn θˈæliəm aɪ səlˈuːʃən.
It is produced by the reaction of thallium with oxygen or hydrogen peroxide in an alkaline thallium(I) solution.