CPV code 24212000 designates Chromium, manganese, magnesium, lead and copper oxides and hydroxides in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
24212000 sits under 24210000 (Oxides, peroxides and hydroxides) and groups 6 more specific sub-codes. When classifying a tender, choose the narrowest code that still covers the full subject of the contract.