I don't think the problem with smut is deriving from the tank or procedure. I am anodizing several items at once, and the same two parts are turning black every time, even with a replacement part. Is some aluminum so bad that you can't use this system, or is there a special technique past the usual polishing, degrease/de-ox steps to help.
The parts are from Japan, but so are some other parts that are coming out perfect. Also, sometimes when I tumblw the finished parts in a untreated corncob media for about a half an hour it will take a little of the matte finish off and shine it up a little. It seems that a lot of pieces come out looking like I painted it instead of anodizing.
I use a rectifier and follow the guidelines (I use the high temp sealer too)
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