Molten semi-conductors have potential utility in thermoelectrics or heat-management at high temperature (900 degrees C and above), though their development requires further analysis of their thermal conduction mechanisms, in particular radiative heat-transfer. Using a container-less method based on the floating zone furnace, the optical emission properties of a pendant droplet of molten tin sulfide (SnS) are investigated in the UV-visible (200-850 nm) and near112 (900-2050 nm) ranges. The emissivity results suggest a low emissivity for molten SnS at the peak of radiation for the temperature range of 890-950 degrees C. Corresponding estimates of radiative thermal conductivity suggest its minor contribution to the overall thermal conduction of molten SnS. (C) 2018 Elsevier Ltd. All rights reserved.