Optical and conductivity measurements have been made on rutile (TiO2) samples implanted with 28 MeV deuterons and 56 MeV alpha particles. An assumption is proposed to explain the localization of the coloration at the end of the particles paths: chemical reactions of implanted deuterons imply the formation of Ti+3sites, which is not the case with implanted alpha particles. The oscillator strength of 10−3, deduced from optical absorption profiles, for the optical transition of the 1.35 μm absorption band in chemically implanted rutile supports the assignment of ad–dtransition localized at a Ti+3site for the “blue” band. The analysis of the distribution of conductivity along the particle path and infrared absorption measurements seem to conform this hypothesis.