Part 11: reagents, sampling, test procedure for copper in alloys containing 7 to 25 per cent lead; applicable to copper contents 70 to 90 per cent. Part 12: reagents, sampling, test procedure for lead in alloys containing 7 to 25 per cent lead.Cross References:BS 1400BS 1499BS 1748:Parts 1-5BS 2870BS 2871BS 2872BS 2873BS 2874BS 2875