Message 24081 of 39188 in General Discussion

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 But for lime 
> this doesn't help much. The prevention is due to the vitamin C and 
> citric acid in lemon juice. Both are already present in lime or any 
> other citrus fruit as well. You don't need to "protect" citrus with 
> lemon like you do with other fruits or vegetables.

Actually it makes perfect sense because he's trying to prevent the browning of 
the outer skin of the lime by putting lemon juice on it.  The citric acid of 
the lemon juice prevents oxidation which is reponsible for turning the skin an 
off color.  Limes have citric acid in the flesh, not the outer skin.

Ever seen a lime (or lemon) get moldy?  Fungi don't like growing in low pH 
environments but they can easily take hold on the outer surface of a citrus 
fruit.