red it more easy to dye and can guarantee good results...if the colour faded, it'll become blonde...other colors especially blue are difficult to dye because eventhough it's blue, the outcome might be different depending on the hair texture...and blue color also doesnt stand out if sum1 with dark coloured hair dyes it...
I want to highlight or color the tip of my hair blonde, or dye everything red or hazel. Unfortunately, would not go well at work......
