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Some aluminum will blue...most times it goes more black than "blue".
Brass Pro and other gunshops carry Cold Blue and Aluminum Black
....best to do a test spot somewhere discreet to see how it'll react.
....sometimes, where cold blue solution will not seem to have effect on AEG parts, Aluminum Black may be more effective.
A little goes a long long way...my last bottles of the stuff lasted for years. Keep sealed, apply sparringly. Always use a fresh applicator (i.e. qtip/bit of cloth) if you don't want to contaminate your bottle. If the salts precipitate out of solution...it's obviously going to be weaker and less effective.
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