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The content of chlorophyll pigments in vegetable oils is expressed as mg of pheophytin a in 1 kg of oil. Replaced by AOCS Official Method Cc 13k-13.This method determines total chlorophyll pigments, expressed as pheophytin a, in crude vegetable oils. The method is suitable for the determination of quantities of chlorophyll pigments higher than 1 mg/kg (1 ppm). The chlorophyll pigments are determined by measuring the absorbance at 670 nm, correcting the result for the background absorption, and calculating the content with the use of the absorptivity of pheophytin a, which is the main chlorophyll pigment in crude vegetable oils.