english: Anhydrous samples can be purified by sublimation in a stream of hydrogen chloride gas, followed by heating the sublimate to 400 °C in a stream of dry nitrogen gas.
non_english: Sampel anhidrat bisa dimurnèkaké kanthi sublimasi ing aliran gas hidrogen klorida, diiringi pamanasan sublimasi ing 400 ° C ing kahanan garing aliran gas nitrogen .