I have known my hairdresser for years and he told me which colour for my hair of semi permanent and then as it washes out my hair looks like it is highlighted He also told me if you buy same type you can mix colour and I have tried that too would never pay salon prices but he sometimes does it for me as a birthday present!
Have a go with semi permanent first to get right shade
if you dont like it it will soon be gone
have fun
good luck