Hello
I sent a friend to a refinisher I knew to have his Pre-War Heavy Duty refinished. A Year afterwards, it's cylinder started turning Plum in color. My friend told me of it, I contacted the refinisher and he refinished the cylinder again so now it match's his revolver. I asked the refinisher why this happened and he explained the bluing salts got just a little too weak and the fact they must not have had the cylinder Hot enough when they blued it, is what attributed to it's Plum color. He shared with me that the Older S&W revolver's had much more Nickel content in their steel and this is very hard to penetrate with Modern Bluing slats if they are off, or the part is not hot enough to accept them fully... Hammerdown