I have blonde highlights but they are half grown out. My natural colour is dark blonde. My roots are healthy and shiny but the highlighted hair is quite dry/damaged so I'm reluctant to have the highlights again but I hate having two colours! Ideally I think I would like to go lighter blonde than my natural colour but darker than the highlights. What's the best way of doing this? Can I put a home hair dye over highlights or will my hair go green?!! Do semi permanent wash in/wash out dyes still exist as all I can see in places like boots are permanent dyes. Any help appreciated as I'm a bit clueless! Thank you