"Morning" Colored Titanium Pin

E. Douglas Wunder colors titanium with electricity to design his "Morning" pin.

That's Clever! : Episode HCLVR-339 -- More Projects »
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Step 10
10. Dip the cloud part in a bath of mild acid to clean and prepare the titanium surface to be heat-colored. The part is washed and dried and placed on a wire hook. Heat the surface area with a lit torch. Bold random colors of purple, blue and bronze will emerge.