I came across prell shampoo, when i went shopping and immediately put it in my shopping cart. My hair is naturally blonde, but I did not take them seriously. Now when my friends put it to my notice, I am conscious. So now, I’m just ready for my natural color. Here I want to ask you if I bought Prell and used it every day how long until my natural color is back. Is there any special time of the day I can use it?