Overtone is a tinted conditioner (not a dye!) that some women use to add fun colors to their hair. A lot of young women use the silver shades to tint their hair silver or slate gray.
If you have lighter hair (blonde, strawberry blonde, light brown), or if your dark brunette dye has REALLY faded (to a light orange), I think Overtone Extreme Silver Deep Treatment could work to blend your faded dye with your natural grays
It turned my natural silvers a deeper silver color (which will fade after a few shampoos) – in fact, they even have a slight blue tint (which doesn’t bother me but might drive some people up a wall!).
I like the slate gray/blue tint it gave my silvers, but I’m also happy with my natural silver color, so I think I’ll probably wait to try the Overtone again once my dyed bits have faded quite a bit more to see if it “takes” better.