Oxalic acid is the most effective antibrowning agent on apple slices, 12 while HWT alone or HWT followed by an HCl dip are also effective in reducing browning andmaintaining a distinct red color. These methods seem to be more attractive than the SO 2 treatment of litchi fruit, but after these treatments the aril becomes brown. 6,13 We became interested in examining whether HWT combined with an oxalic acid dip could replace use of HCl and SO 2 to produce high quality and safer litchi fruit. The objectives of this study were to investigate the effects of oxalic acid on browning inhibition and to compare its inhibitory effectiveness with citric and ascorbic acids, combined with hot water treatment. The effects of oxalic acid on the inhibition of PPO and POD activities and total anthocyanin content were also evaluated.