I've been coloring my hair for years and normally use a permanent hair dye at home between salon colors. I have lots (about 95%) white hair and for some, unknown reason, I bought lush henna. I used to use it years ago before I was so great and loved it - could even overlook the smell and the mess. However, I'm wondering if it's wise to go for it with so much grey (currently have lots of grey roots).
Also, if it doesn't cover the grey properly, can I put a permanent color on top or will it not take over henna?