Dr. Singer’s position is that:
1. The Murex Trunculus in no way resembles the desciption of the chilazon as cited in Menachos (P.S. the Radzyner’s cuttlefish certainly comes closer.) and 2. Most compelling is that Murex dye is chemically the same as kla ilon (indigo) and will not pass the practical test described in Menachos loc. cit.