As mentioned by ocharry, aluminium doesn't blue. Immersion into a bluing tank will dissolve the aluminium. You can use Birchwood Casey Aluminium Black like natman suggested or you can paint it to match (as best as you can). Hang it on a wire, spray 'n bake!
BTW, if you do it in a toaster oven, make sure you don't do it in your wife's toaster oven. She'll be pissed and you'll never hear the end of it. Buy one at a second hand store just for gonne smything.
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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