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I have done several touch-ups and a couple of complete pistols using Brownells' Oxpho-Blue (liquid, not paste) product. It's easy to work with and the resulting finish seems to be fairly durable and resistant to wear. My only dislike is that it's not as deep and black as the classic bluing on old Colt and S&W firearms. But I've tried other cold blue products and the results were disastrous.
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