Product Details: Grade StandardReagent Grade , Industrial Grade Purity87 SourcePlants Crude Glycerin  Crude Glycerin is a dark brown, viscous and hygroscopic liquid. This substance is derived from trans-esterification of crude edible oils. For application of this product, some refining process are done on it. After this stage its' content will be increased and will be reached to USP/BP grade that is called Refined Glycerin and could be used in many fields.