After UV-C exposure and thermal pasteurization, an increase in lightness (L*), and decrease in redness (+a*) and yellow-ness (+b*) were observed in juice samples. The increase in L*value makes the juice brighter and more transparent due to impairment of coloured compound initially present in juice.Natural pigments such as carotenoids largely contribute to the yellow colour (+b*value) of Chokanan mango juice and heat causes accelerated carotenoid is omerization (Rodríguez-Amaya, 1997) which leads to loss of yellowness in juice(decreased +b*value). Moreover, decrease in (+a*) and (+b*)might be attributed to the development of browning components (Ibarz et al., 2005).