This is a good etchant if you are going to etch and evaluate a bar of copper - IT IS A BAD ETCHANT TO USE FOR PLATED COPPER DEPOSITS It will "overetch" the small grain sizes of plated copper and mask cracks and separations. Again it is a good etchant for formed copper, but not the etchant of choice for boards.. IPC test method for microsectioning gives the ammonium hydroxide hydrogen peroxide etchant and that is the only etchant that is recognized by the government for all of their test labs. It is a nightmare to try and correlate results if the labs do not use the same etchant. Susan Mansilla Robisan Laboratory *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************