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Why does my titanium anodizing dull when touched?  

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Why my titanium colour by anodizing will turn down brightness when use my finger touch it?

I had put it in boil water one hour.Why? Please help me?Thank you !

Steven Li
- China

Dear Mr. Li
As you know colors appeared on anodized titanium surfaces are exactly depended on thickness of oxide layer which is a transparent layer. these colors are known as interference colors,so when the surface is coverd with any contamination the colors will be changed (for example brightness will be changed or ...).
when you touch a surface of anodized titanum, a thin layer of oil will be remaind on this surface. if you wash the contaminated surface with any detergent, the orginal color will be appeared again.

Shahram Ghahremani
- Tehran, Iran