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Anodizing
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===Titanium=== [[Image:Anodized titanium colors.svg|upright=1.2|thumb|Selected colors achievable through anodization of titanium]] An anodized oxide layer has a thickness in the range of {{convert|30|nm|sp=us}} to several micrometers.<ref>{{cite web |url=http://www.ecmjournal.org/journal/supplements/vol005supp01/pdf/vol005supp01a18.pdf |title=ECM - eCells & Materials Conferences - Open Scientific Discussion |access-date=2011-06-15 |url-status=live |archive-url=https://web.archive.org/web/20110927220010/http://www.ecmjournal.org/journal/supplements/vol005supp01/pdf/vol005supp01a18.pdf |archive-date=2011-09-27 }}</ref> Standards for titanium anodizing are given by AMS 2487 and AMS 2488. AMS 2488 Type III anodizing of titanium generates an array of different colors without dyes, for which it is sometimes used in art, [[costume jewelry|costume jewellery]], body piercing jewellery and [[wedding rings]]. The color formed is dependent on the thickness of the oxide (which is determined by the anodizing voltage); it is caused by the interference of light reflecting off the oxide surface with light travelling through it and reflecting off the underlying metal surface. AMS 2488 Type II anodizing produces a thicker matte grey finish with higher wear resistance.<ref>{{cite web |title=AMS2488D: Anodic Treatment - Titanium and Titanium Alloys Solution pH 13 or Higher - SAE International |url=https://www.sae.org/standards/content/ams2488d/ |website=www.sae.org |publisher=SAE International |access-date=4 January 2019}}</ref>
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