Abstract: Electrically conductive copper layers in conductor plates and electrical components having a black metal coating which is acid-soluble and capable of being applied in an acidic medium are more easily prepared and have superior properties. In the process of preparation, such conductor plates provided with a resist and, optionally, with through-contacts, and having free copper areasa) are galvanically coated with a coating of a black metal in an acidic medium;b) the resist is removed and then the copper areas having been exposed thereby are removed by etching;c) the conductor plates are provided with an adhering solder mask;d) at those parts that are not covered by the solder mask the black metal coating is removed and, if desired, the copper areas exposed thereby are provided with a well solderable metal layer.

Abstract: Electrically conductive copper layers in conductor plates and electrical components having a black metal coating which is acid-soluble and capable of being applied in an acidic medium are more easily prepared and have superior properties. In the process of preparation, such conductor plates provided with a resist and, optionally, with through-contacts, and having free copper areas(a) are galvanically coated with a coating of a black metal in an acidic medium;(b) the resist is removed and then the copper areas having been exposed thereby are removed by etching;(c) the conductor plates are provided with an adhering solder mask;(d) at those parts that are not covered by the solder mask the black metal coating is removed and, if desired, the copper areas exposed thereby are provided with a well solderable metal layer.