Objective measurement of colour is possible using a variety of reflectance or light transmitance spectrophotometer. Colour perception depends on the type and intensity of light, chemical and physical characteristics of the commodity, and person’s ability to characterize colour. Although human eye is used to evaluate colour but results can vary considerably due to human differences in colour perception. Therefore, an instrument (objective method) is used to provide a specific colour value based on the amount of light reflected off the commodity surface or light transmitted through the commodity. This instrument can measure small differences in colour accurately and can be automated in the packing line. This instrument is popularly known as Colour Difference Meter. This instrument use colorimetric method for colour measurement.