Ruthenium Dithionate, RuS₂O₆

By the continued passage of sulphur dioxide through the sulphate solution the blue solution mentioned above becomes colourless, and Ruthenium Dithionate, RuS₂O₆, is produced in solution. It is precipitated from the solution as a yellowish white powder by addition of alcohol. On dissolving in water and concentrating, the salt is obtained as a yellow crystalline mass of radiating fibres. It is readily soluble in water and in acids. When warmed with permanganate solution ruthenium sulphate is produced.