Hi I have a client who's wanting silver highlights, she's level 4/5 with quiet a lot of natural grey around the front, she's wanting to add highlights around the top and sides and keep the underneath her natural dark colour which is pretty flat there's no warmth in her natural hair. My question is iv been looking at the pulp riot high speed toner silver but I'm worried it will shift her natural base and make it slightly warmer? Iv never used these before so have no experience in them, I use wella but we have tried a million different combinations to make silver and its never enough so thought I'd look at other options. I have also looked at crazy colour and other direct dyes but worried they may fade out to a unwanted colour.