Edges

[cga3a]

I'm anodizing 6061 Aluminum (square shape) and find that the edges don't take the anodize like the rest of the part. The coloring is lighter if not at all.

cga3a

[acidrain]

What is your set up? Cathode size adequate?
It sounds like maybe the parts are surface contaminated along the edges. Did you degrease, and did the parts pass the water-break test?
I've never had parts react like that.