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How to produce a dull grey finish on anodized aluminum?

I have a small anodizing cell and I want to produce a dull grey finish on anodized aluminum. I have some success when over etching but the finish is still silver in color. I do not particularly want to introduce a dye as this will fade over time. Has anybody any suggestions?

Bill Taylor
P.M.E - Co. Offaly. Southern Ireland
2005

Have you tried etching even deeper? maybe doing a sand/bead blast prior to anodizing?

Jason Aube
- Flint, Michigan
2005

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