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Common sense tells me that by applying the color in the front first including sides with grey coverage will allow the color to process slightly longer and where it needs it the most. also believe it or not makes the hair color appear more natural when it processes slightly longer in the front giving a more even coverage. When I am doing more creative work I apply the color starting in the back of the head working my way towards the front and sides 90% of the time, because I either have already placement my details(foils ect.) or I am using more than one tint shade on the hair for color layering. I also operate this way when I am dealing with high-lift blonde tints, again it makes more sense allowing the color to sit longer while I am finishing up the back of the head. If you are one of those people who love to try unconventional way’s in the hair color world try applying your grey coverage tints in the front first, it will make a difference with a better result in coverage.