Etchants

1. Hydrogen peroxide…………..displayed gold/copper tint difference
   • Composition
     " 1 pt. 3% H2O2 solution
     " 1 pt. H2O
     " 1 pt. NH4O4
   • Method
     " Tilt sample towards dip
     " Swab with etchant-soaked cotton 3x downward
     " Water wash, ethanol wash, dry

2. Aquious Ferric chloride………..etched copper grain boundaries
   a. Composition
   " 70ml H2O
   " 5g FeCl3
   " 30ml HCl
   c. Method
   " Submerge sample for 2 seconds
   " Water wash, ethanol wash, dry

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Deplition Gilding technique

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This site was last updated on Feb 12 2003