| http://www.w3.org/ns/prov#value | - I have worked extensively (in the real world, often outside of properly equipped laboratories and often lacking even the most basic safety precautions.) with concentrated Hydrofluoric acid, concentrated Nitric acid, concentrated Sulphuric acid, concentrated Hydrochloric acid, Mercury metal, Mercury 'salts', Sodium Cyanide, Potasium Cyanide, and other really nasty stuff.
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