Hi,
Best way to solve these problem is to use a caustic etchant. An
excellent one is to use CuSO4 mixed with Ammonia. It will build a
tetra-ammin complex Cu(NH3)4++ which is the active etchant of the
Copper. It will never attac Nickel.
Best regards
Armin
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com