Hi Brande - What type of reagent are you looking for?
1. one that will macro etch the brazed joint on Cu-Cu brazements?
2. one that will macro etch the brazed joint on Cu-SS brazements?
3. one that will macro show the residual chlorides from flux that remain?
4. an etch that will show the microstructure?
Or do you have something else in mind??
Bob Peaslee