Black Oil Fatty Acid Application Enquiry Now It is used as a fuel for steam boilers & heaters.It can also be used in manufacturing of black soap which is used for cleaning utensils. PARAMETER SPECIFICATION Appearance Dark Brown Viscous, liquid. Acid Value 110 Max. Iodine Value (wijs) 120 Max. Saponification Value 160 Min. Specific Gravity @40°C 0.925 – 0.945 Packing : ISO Tank / Flexitank / IBC / Drums / Bulk Note : This product can also be modified as per client’s requirements.