The Sweets seems more obvious to me than the Montana Extreme solvent as far as showing the blue color. I just went and played with some, but couldn't get a very good test because all the rifles I shoot with any regularity have been treated with Dyna Bore Coat (now officially called DYNA-TEK Bore Coat), and I just don't see very much copper any more.
I will do some more comparison testing next time I get my hands on a badly copper-fouled bore. Thanks for your inputs.
