Patent ID: 7357879

Claim:
An etching solution comprising: a solution of cupric chloride and at least one triazole type compound added to the cupric chloride solution; and at least one amphoteric surface active agent selected from the group consisting of alkyldimethyl betaine aminoacetate, alkyldimethyl betaine acetate, alkyldimetyl carboxymethyl betaine, alkyldimethyl carboxymethylene ammonium betaine, alklydimethyl ammoniumacetate, fatty amide propyl dimethyl betaine aminoacetate, alkyl amide propyl betaine, alkyloyl amide propyl dimethyl glycine, alkanoyl aminopropyl dimethyl ammonium acetate, palm oil fatty amide propyl betaine and palm oil fatty amide propyl dimethyl betaine aminoacetate.