The bleaching efficiency of the ZnO/Kaolin sample was then determined by measuring the amount of pigment in the bleached oil using a UV spectrophotometer. The samples were determined at a wavelength of 450 nm using the UV visible spectrophotometer. The efficiency of the adsorbents used was expressed in terms of absorbance of the light passing through the medium (crude and bleached palm oil), which will then be convertedinto percentage color reduction of the bleached oil according to equation 1 according to Vincent Nwoye Okafor et al., 2019. The developed model correlated the response (Iodine value) to the process variables (Dosage, Temperature and Time) using second degree polynomial. The model selected was based on the highest order model where the additional terms were significant and the model was not aliased and there was reasonable agreement between Adjusted R-Squared and predicted R-squared (within 0.2 of each other).