What etchants do you use to etch brazed joints to visualize the joint metal for metallography using an optical microscope? For instance, stainless steel brazed with BAg-24, or titanium Grade 5 brazed with TiBraze200? I cannot find etchant formulations in the literature, and I am having a hard time seeing the brazed joint properly. Many times we don't have time to send samples for electron scanning microscope study. I may be overetching my samples, but I want to make sure that I am seeing the correct things.