NF A06-221:2011 Reference test method for release of nickel from all post assemblies which are inserted into pierced parts of the human body and articles intended to come into direct and prolonged contact with the skin.
2011NF S11-555:2011 Reference test method for release of nickel from those parts of spectacle frames and sunglasses intended to come into close and prolonged contact with the skin.
0000 NF A06-221:2008
1999NF A06-221:1999 Reference test method for release of nickel from products intended to come into direct and prolonged contact with the skin.