We have carried out experimental investigation on binary ice mixture containing carbon disulfide (CS 2 ) and ammonia (NH 3 ) ices formed at 10 K. Icy films were formed in various combinations to investigate the reactivity of CS 2 and NH 3 molecules on cometary nucleus. In the case of NH 3 ices, deposition carried out at 10 K was found to contain NH 3 homo-dimers that was found to reorient upon annealing to 40 K. Phase transition was found to take place as the 10 K ice was warmed to higher temperatures and the phase transition temperature was found to be 5 K higher for the mixed ice in comparison to the layered deposits. Thermal processing of the mixed deposition of CS 2 -NH 3 ice was found to leave thio residue, which could be ammonium dithiocarbamate that was even found to be present at 340 K. © 2016 COSPAR.