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My PT 145 extractor is black, but I've never used a wire brush on it because I wouldn't want to take the chance of scratching the outside of the slide. I have to think that perhaps you were seeing a reaction of the solvent to the powder or brass residue on the extractor. I am not sure of the material used in the manufacture of the part, but I would think that MIM couldn't be used in that application due to the stresses and spring action needed in that function.

Perhaps someone else will come along who has experienced the color change and can enlighten you more. You could also call customer service, but be aware that they have some peak volume times. Mondays are probably the worst and they have extended their hours into the evening now.
 
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