Ammonium Thiocyanate is used for carrying out tracer study in oil & gas fields.The material shall be in the form of colour less deliquescent crystals, free from visible impurities. Assay as NH4SCN, percent by mass: 97 (Minimum)Material in Distilled Water: 4.5 - 6.0Chloride as NH4Cl, percent by mass: 0.1 (Maximum)