Composition for blackening copper-based or silver-based metals

  title={Composition for blackening copper-based or silver-based metals},
  author={喜多 あずさ and 博章 酒井 and 姜 俊行},
The present invention addresses the problem of providing a new composition for blackening that, without compromising the smoothness of copper-based or silver-based metals, allows for sufficient blackening of copper circuits of printed wiring boards, circuits formed by silver paste, and products containing copper-based or silver-based metals, such as other various kinds of copper, copper alloys, silver, and silver alloys. The present invention provides a composition for blackening copper-based… CONTINUE READING