@article{oai:nagasaki-u.repo.nii.ac.jp:00015727,
 author = {Shiraishi, Takanobu and Takuma, Yasuko and Miura, Eri and Fujita, Takeshi and Hisatsune, Kunihiro},
 issue = {3},
 journal = {Materials Science and Engineering: B},
 month = {Jun},
 note = {The effects of alloying addition of a small amount of base metals (In, Sn, Fe, Zn) on color variations in Pd-free Au-Pt-based high noble dental alloys were investigated in terms of rectilinear and polar color coordinates. The ternary Au-Pt-X (X = In, Sn, Fe, Zn) and quaternary Au-Pt-In-Y (Y = Sn, Fe, Zn) alloys were prepared from high purity component metals. The amount of alloying base metals, X and Y, were restricted up to 2 at.%. The alloying addition of a small amount of Fe, In, Sn, to a binary Au-10 at.% Pt alloy (referred to as AP10) effectively increased chroma, C*. On the other hand, the addition of Zn to the parent alloy AP10 did not change color coordinates greatly. The increase in chroma in the present Au-Pt-based high noble alloys was attributed to the increase in the slope of spectral reflectance curve at its absorption edge near 515 nm. It was found that the addition of a small amount of Fe to the parent alloy AP10 markedly increased lightness, L*, and the addition of Sn gave a very light tint of red to the parent alloy. Although red-green chromaticity index a* contributed to chroma to some extent, contribution of yellow-blue chromaticity index b* was much greater in determining chroma in this Pd-free Au-Pt-based multi-component alloys. The present results are expected to be valuable in case color is to be taken into account in designing Pd-free Au-Pt-based high noble dental alloys., Materials Science and Engineering: B, 140(3), pp.147-152; 2007},
 pages = {147--152},
 title = {Variations of color with alloying elements in Pd-free Au–Pt-based high noble dental alloys},
 volume = {140},
 year = {2007}
}