| 摘要 |
The invention relates to an electrolytically recoverable etching solution, especially for etching printed boards and molded parts from copper and copper alloys. Said etching solution is substantially constituted of water, ammonia, copper (II) sulfate, ammonium sulfate and optionally a vanadium-containing catalyst for increasing etching speed. The inventive etching solution is characterized by additionally containing methylene blue or its derivatives as a catalyst.
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