hi geeks. I have a lady tomorrow who fancies a change. She’s 100% grey and normally has full head of highlights (bleach 7nn 7gb 8nn 8gb) she loves the silvery grey tones. So I’m going to do a full head of bleach foils then tone with nxt 8.12 which is a metallic silver blonde. Do you think this will be ok over her grey bits that will be weaved out beteeen the foils