ɔːltˈɜːnətˌɪvli, ɪt kæn biː kɹiːˈeɪɾᵻd baɪ ðɪ ˌɑːksɪdˈeɪʃən ʌv θˈæliəm aɪ nˈaɪtɹeɪt baɪ klˈoːɹiːn ɪn ɐn ˈeɪkwɪəs pətˈæsiəm haɪdɹˈɑːksaɪd səlˈuːʃən.
Alternatively, it can be created by the oxidation of thallium(I) nitrate by chlorine in an aqueous potassium hydroxide solution.