Christensen O B, Möller H
Contact Dermatitis. 1978 Dec;4(6):343-6. doi: 10.1111/j.1600-0536.1978.tb03847.x.
The release of nickel to boiling water from new and used saucepans of different material was measured. No nickel was released from aluminium, teflon and enamel. Certain amounts of nickel were released from stainless steel, but only at acid pH.