Potassium dithionite or potassium hydrosulfite is a potassium salt of dithionous acid. It is a powdery or flaky light-yellow colored solid. It is used to make dyes and other chemicals
The compound has UN number UN 1929. As a dithionite, it is closely related to sodium dithionite, which is a commonly used reducing agent and bleaching agent.
See also List of UN numbers 1901 to 2000
References