Sun In Color

Although my hair color is changing on its own, I would love to have some sporadic color throughout my locks. How many of you remember SUN-IN? http://www.sun-in.com/lemon.asp I was never allowed to use it as a teen because my mother was against me coloring my hair, but a friend of mine use it and turned her hair from a brownish color to a blondish. Well we all see that my hair is far from brown, and so I'm wondering if it will turn my hair to blonde or will it bring out the natural red undertones? I figure I could use the Sun-In with Lemon Juice, because lemon juice itself will turn the hair color. Or hmm, maybe I should just mix up some lemon juice and water, spray that on and go it in the sun. I have to look into this one, because its natural and I don't think I would harm the settling process of my locks.