Mentha Piperita Oil : Protocol Standards: Description : Colourless Pale Yellow to Pale greenish Yellow. Odour : Characteristic odour. Solubility : Freely soluble in ethanol. Optical Rotation -10.00 To -30.00 Specific Gravity : 0.900 To 0.916gm/ml Refractive Index : 1.457 To 1.467 Assay By Glc Limonene : 1.00% TO 5.00% Cineole : 3.50% TO 14.00% Menthone : 14.00% TO 32.00% Mentha Furan : 1.00% TO 9.00% Iso-Menthone : 1.50% TO 10.00% Menthyl Acetate : 2.80% TO 10.00% Iso-Pulegole Max.: 0.20% Menthol : 30.00% TO 55.00%