Input needed by some of the inhouse pro's.....

[Fibergeek]

I'll take a crack at the different alloys of aluminum in the same batch question:

I haven't tried different alloys in the same batch, so take this one as only an educated opinion (guess?).

In the reference paper at the rear of the LCD instructions; the first anodization curve shows 3 different alloys done at 3A/sq.ft. These were done individually, not in the same batch. An effort was made here to insure that each sample was identical in every respect except alloy (same size, same prep, same connection method, etc.) Notice that the 3 curves almost overlay each other. Its reasonable to assume that the alloy content will have some effect for chemical reasons alone. But this curve leads me to think that its less than is generally assumed. Either that or the closed loop anodizing provided by the constant current source is compensating for the differences, or maybe both. If that helps any.