Mix Ratio: 1 part haircolor, 2 parts developer. Lighter than natural shade, first time application: Develop for 15 minutes, check, then process up to an additional 15 minutes or until color is even. ... Select a shade level 8 or darker for best coverage; Lighter shades will create a translucent effect.
Is color charm a good hair dye?
It's far superior to any other brands. The colors are the most natural and leave my hair looking much healthier than others. I have a high % of grey and find this gives very good coverage. I still have to retouch my roots every 3 weeks but I'm happy to use Wella that frequently.