Safety
Potassium sodium 2,3-dihydroxybutanedioate is an irritant. Hydrogen peroxide is corrosive. Hydrated cobalt(II) chloride is toxic. The dust may be irritating and, in larger doses, severely damaging to the respiratory tract. Skin contact, inhalation or ingestion should be avoided.
Special tips
If the reaction gets too hot or the reactants are too concentrated, effervescence from the reaction could cause the mixture to spill out of the beaker.