I've been colouring my hair since I was 13 (I'm now just turned 60). Original colour extremely dark brown, almost black, but I've had all sorts of colours and styles over the years. Past couple of years I've used Logona organic cream henna in Nougat to cover turn my grey hair a golden colour because after being dark for so long I felt I looked washed-out with so much grey in my fringe area. Most recently used a Daniel Fields Watercolour in golden blonde, didn't seem to do much other than condition my hair.
A year or so ago I had a yearning for deep purple hair, used Manic Panic Violet Night. OMG!
I looked like I had a fright wig on! The colour was so intense and really didn't suit me, so lots of shampooing later I reverted to the Logona henna. About 6 months ago used MP Raven just on a small area front and back and luckily it wasn't too intense and has faded over time to a sort of burgundy.
Now I've got a couple of centimetres of grey/silver at the roots and I've just ordered Directions lilac to brighten them up a bit. Goodness knows how well it will take, and how it will look if it bleeds onto the hennaed blonde. I'll let y'all know