Logic,
First are you sure is 6061? Some other alloys will "smut" real bad and the gray tint is what it looks like. Second being that you are blasting your parts first will make them have a different finished color due to the ruffed up surface. Third don't boil to seal, hang the part in the steam. You are losing alot of color by boiling it out of the pores before they can seal. Fourthly( is that a word?) what temp is your anodizing bath at when you are running your parts? To warm and the pores are to big and don't hold color.
Hope this helps,
Tim
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