the acidic content of lemon juice will result in dry hair. it may lighten hair, a few shades, perhaps. it won't take brown hair to blonde--too many shades inbetween the two.
as with any 'lightening' product, natural or chemical, your hair's porosity/condition will be compromised, and must be treated as such. moisturize and care for hair after any chemical change, be it from lemons, pool-water, hot tool-usage, or lightening products. end of story
at 10:05 AM on Apr. 7, 2009