Birchwood Casey makes a liquid product called "Aluminum Black". I've used it on Mag Lights, and it matches pretty good. Don't know how it would do for "deep blue", though.
In my limited experience, the aluminum black does not hold very well (it is similar to cold bluing) and anodizing is not very available. The best bet may be one of the very good paints now available which can look good and are in fact used now by some factories on aluminum parts in lieu of anodizing.
Aluminum is a tough one. It cannot be blued the way you would blue steel. the caustic solution will etch it, and if its of poor quality may even dissolve it. Your only real choices are to have the parts powder coated, anodized, laquered, or finished with a thermoset like Cerakote.
Powdercoating is prolly the cheapest to have done next to baking laquer, but niether finish is very tough. anodizing is tougher and gives you alot of color options but again it isnt very tough. Cerakote is your only real choice for a wear resistent finish that looks good and has lots of color/appearance options. And cerakote is among the top performers of the thermoset world. I have used most of them and Cerakote is by far the best.
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