Important: One thing to note up front here is that not all images actually have any areas in them that are supposed to be neutral gray, and obviously, you can't find what's not there, so if that's the case with your photo, no technique for finding midtone gray will work.
Unfortunately this colour is much more true to blue than green. I now have a soft turquoise but washed the colour out after only 10 minutes. So I'll be surprised if it lasts for more than 2 weeks. Overall I think the Joico colour has great pigment but don't go with the colours you see on the package!!
How to Re-dye. Whether your hair was colored by a professional or at home, speak with a salon colorist to assess the damage before dyeing again. Single-process coloring is typically done once a month, and highlights are applied every two to three months.bout the Hair and Coloring. Hair dye lifts the outer scales of the hair follicle to alter the soft inner core. Re-dyeing too quickly can cause the scales to flare up, creating a dry, frizzy appearance.