Thallous thiosulphate, Tl₂S₂O₃

Thallous thiosulphate, Tl₂S₂O₃, is obtained as a white crystalline precipitate by adding potassium thiosulphate to a solution of a thallous salt. It can be crystallised from hot water, and begins to decompose at 130°. Sodium thallous thiosulphate, 2Tl₂S₂O₃.3Na₂S₂O₃.8H₂O, is known.