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 isomerization (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 compo- nents (Ibarz et al., 2005).