I have struggled with satisfying a client wanting vibrant copper. 7kg in goldwell is the comparison that is desired. She was a true copper head, level 7. She now is a dull level 8 with a little warmth and 50 percent gray... I have tried several formulas. The closest that I have come to her liking is using 8ro and 9r.....still not vibrant enough. When I add a little 6ro it then becomes too dark. And the fade factor is terrible. She uses your shampoo and condioner. Her hair is curly and coarse. I cleanse prior to application.