Forbidden.
Banned
Soluble compounds
Insoluble compounds
- Group 1 and NH4+ compounds
- nitrates
- acetates (ethanoates)
- chlorides, bromides & iodides (except Ag+ and Pb2+)
- sulfates (except Ag+, Pb2+, Ba2+, Sr2+, Ca2+)
Insoluble compounds
- carbonates, sulfites & phosphates (except Group 1 and NH4+ compounds)
- hydroxides & oxides (except Group 1, NH4+, Ba2+, Sr2+, Ca2+ compounds)
- sulfides (except Groups 1, 2 and NH4+)