Rutile Visible Spectra (400 - 1100 nm)

Rutile, TiO₂, would be nearly colorless nearly colorless if it were purely titanium dioxide. It commonly has minor amounts of iron, chromium, vanadium, niobium, and hydrogen. A small amount of reduction produces Ti³⁺ ions that enter into electron exchange with the Ti⁴⁺ ions and cause blue color.

Rutile absorption spectrum 

• Rutile;  Brownish red-orange rutile from North Carolina, USA. The sample is 2.69 mm thick. Data Files: E perp c;  E||c
  

• Rutile DV-1, Graves Mountain, Georgia, USA. A 0.040 mm thick orange sample that is opaque when more than 1/2 mm thick. This crystal has about 1.3% of other ions in the proportion Cr~Fe>V>Nb. Data Files: E perp c;  E||c

Link to references about the spectra of rutile

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