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3. UN Class 4.3 Dangerous when wet

3.1. Rhubidium

 
 
Rhubidium is within group 1 of the periodic table and is an older brother to th elikes of lithium, sodium and potassium. The pink colour of the water is the result of a  corrosive rhubidium hydroxide solution forming in the water. Remember, all directly water reactive materials and almost al UN Class 4 materials will have a corrosive run-off.