Yellow orange shade after champagne H23 anodizing

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The problem which I am facing is after anodizing the aluminium building profiles in champagne shade (H23) some yellow and orange kind of shades appear I have tried but unable to overcome this problem. Please suggest.

Junaid
Manufacturer - Pakistan

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Junaid,

Is the variation observed in the work piece? Is it observed in different work pieces of same batch? or is it observed from batch to batch?

The problem could be
1. Variation in Anodic thickness
2. variation in dye concentration (either from batch to batch or improper mixing of the dye bath)
3. Non uniform dye bath temperature
4. Variation in pH

Hope this helps....

Keshava Prasad M
- Chennai, India