TIS 1675-1998 Caprolactam for industrial use.determination of colour of 50% aqueous caprolactam solution,expressed in hazen units (platinum.cobalt scale).spectrometric method
2001TIS 1675-1998 Caprolactam for industrial use.determination of colour of 50% aqueous caprolactam solution,expressed in hazen units (platinum.cobalt scale).spectrometric method