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Anodizing defects

2003

I do a bit of anodizing in my workshop and have problems with with white marks especially in areas where there is a hole in a plate. These areas will not take the dye. I run the system with a 15volt power supply. The funny thing is that on some plates there is no problem,I only anodize for a hobby. Can you help?

Regards,

Dan Dempsey
- Tasmania, Australia

Ed. note: Please see "Where Do White Spots Come From?" in our on-line library section

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