The stiochiometric Mercury sulphide selenide alloy, Hg(SSe), have been grown onto glass substrates at 300K for the first time, in the most stable thin film form by employing a chemical bath deposition method. The ‘as grown’ films were characterized by using XRD, Optical absorption, Electrical measurements and EDAX techniques. The obtained films are dark red in color, stoichiometric, semiconducting and nano-crystalline in a single cubic phase with columnar disk type (spread cabbage) morphology. The cubic Hg(SSe) alloy films were found stable in contrast to cubic HgS. The study of optical property revealed the presence of a single optical band gap at 2.1 eV obeying direct transition law. The dark dc electrical resistivity was found to be of the order of 102 ohm cm. The film exhibits n- type of semi-conductivity.