How do you lighten your hair with lemon juice?

Well.. the lemon juice does not have to be fresh, you can probably sit in the sun for anywhere from an hour upwards, just make sure you pay attention to your hair... I dont think it HAS to be unwashed but that might help because it could retain the juice. The thing is, the juice is making little holes in your hair, which is what lets your hair lighten so it may dry out somewhat, but not too badly. As for how much it will lighten... i guess it depends on your hair color. It will be gradual though. ****They also sell sprays that lightens your hair gradually when you go in the sun that include instructions, which may be a better choice. (such as sun it)