I am going grey but it's coming through in a very patchy pattern. I have predominantly white temples but the top is a taupe brown owing to the grey. Natural brown adds too much red and light brown seems to pull gold. I want a true ash light brown to blend the grey. Can you recommend a permanent colour or what mix of the professional ones I would need? I have had a look at the ever shrinking range of dyes out there and none of them seem to fit. If they say they are ash they look like teddy bear colours.