I have blond highlights in my brown hair, which are growing out and being replaced with white streaks at the roots. I would like to dye the roots blond to hopefully match (or as near as dammit) the highlights. All the permanent blond dyes I've seen in the shops, have bleach in and will lighten my brown hair. Surely there's such a thing as blond dye that doesn't bleach? Surely those older ladies who have blond hair who are covering their grey, aren't bleaching their hair by putting blond dye on it? Can anyone please help?