Editing Anodizing (section)

===Niobium===
[[Niobium]] anodizes in a similar fashion to titanium with a range of attractive colors being formed by interference at different film thicknesses. Again the film thickness is dependent on the anodizing voltage.<ref>{{Cite journal
 | journal = Journal of Applied Electrochemistry
 | volume = 21
 | issue = 11
 | doi = 10.1007/BF01077589
 | pages = 1023–1026
 | year = 1991
 | title = Anodization of niobium in sulphuric acid media
 | first1 = M. A.
 | last1 = Biason Gomes
 | first2 = S. |last2=Onofre |first3=S. |last3=Juanto |first4=L. O. |last4=de S. Bulhões
 | s2cid = 95285286
 }}</ref><ref>{{Cite journal
 | journal = Thin Solid Films
 | volume = 8
 | issue = 4
 | doi = 10.1016/0040-6090(71)90027-7
 | pages = R37–R39
 | year = 1971
 | title = A note on the thicknesses of anodized niobium oxide films
 | first = Y. L.
 | last = Chiou
 |bibcode = 1971TSF.....8R..37C }}</ref> Uses include [[jewelry]] and [[commemorative coin]]s.