Eric, I bought a DH at KTP a few years ago. Cleaned it after use with Hoppes first and then with Balistol on successive cleanings. Second on third cleaning I noticed a coppery sheen that appeared to me to be under the bluing. Successive cleanings removed some bluing to a well used silvery worn appearance. I can only conclude the barrels were at least partially cold-blued and the Balistol affected whatever cold blue was applied. I like Balistol and it has not affected the bluing on any other gun since and I use it on all my guns.
Also Balistol is excellent at cleaning but be careful with oxidized silver on old plated firearms that retain the silverplating. Balistol will remove that nice black silver patina down to the base metal.
Erick
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