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Anti-tarnish of Aluminum Surface

I am producing aluminum utensil products. I found after our pans with exterior polished, they will tarnish in a short time and become dull in color. Can any body teach me anti-tarnish methods to improve the surface ?

Thanks,

Morgan Chiang
- Hong Kong, CHINA

Your aluminum utensils must be anodized, Mr. Chiang.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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