Does Lemon Juice Lighten Your Hair?
Lemon juice can make your hair lighter – Is that true? This actually isn’t a myth, it’s partly true. Lemon juice won’t do anything for your hair if you don’t go outdoors, not even if you try using a blow dryer. If you want lemons to lighten your hair, work a lot of the juice through your hair and then sit in the sunlight for a while. It doesn’t mean that you should only sit; just go out and expose yourself to sunlight. The sun’s UV rays will make your hair lighter.
When you use lemon juice on your hair, the citric acid in the lemon juice opens up the cuticles. Once the cuticle gets open, the hair becomes more receptive to changes from things like the rays of the sun. The acid in lemon juice, the oxygen in air and the UV rays from sun all those combine together and start a bleaching process. Your hair will more quickly become lighter because of the interaction between lemon juice which acts as a catalyst and the sun rays. We refer to this as acid-catalyzed oxidation.