Deterioration of Bleachability Index (DOBI) was added as a quality parameter for measurement of crude palm oil quality at the turn of the millennium. The DOBI index was developed by Dr. P.A.T Swoboda in MPOB (then PORIM) in the 1980s. The DOBI value was used as a guide as to how easily a sample of crude palm oil can be bleached. The DOBI value is a numerical ratio of the UV absorbance of the sample at 446 nm to the absorbance at 269 nm. Hence, it is interplay between the amounts of carotene (UV 446nm) present in the crude palm oil to the amounts of secondary oxidation products (UV 269nm) present in the oil. This is because the carotenes present in crude palm oil will be the first to be sacrificed in protecting the oil from oxidation, due to its high number of double bonds. The higher the DOBI value, the easier it is to bleach the oil through heat and absorptive cleansing bleaching.