The optical properties, index of refraction, n, and extinction coefficient, k, of liquid metals are difficult to measure because of their chemical reactivity and opacity. In recent years, a containerless technique has been developed in which metals can be electromagnetically levitated and melted thus eliminating potential contamination of the liquid by the container. The optical properties are determined using rotating analyzeer ellipsometry, RAE. In this method, linearly polarized light is reflected from the specimen at a known angle of incidence and the polarization state of the reflected light is determined from intensity ratio measurements at different azimuths of a Glan-Thompson analyzing prism.