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Uniformly anodizing titanium

I am anodizing titanium plates and wires in a trisodium phosphate ⇦this on eBay or Amazon [affil links] /water solution and am having trouble achieving uniform coloring over the whole area (~ 4" x 4") of the plates. What can be done in the cleaning phase or maybe during anodizing to guarantee uniformity in color?

Paul Komarenko
- New Haven, Connecticut
2002

Maybe anodizing time is high, the anodizing time is about 1 minute and lower, I have same problem.

Shahram Ghahremani
- Turkey
2004

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