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Best Answer: The directions say to leave the color in for  30 minutes if you want it to last for six months. That refers to the color, NOT the bleach! I myself left the color in for an hour, but the life of the color really just depends your shampooing habits. Also, for Pete's sake, don't let any of the dye get on anything but your hair, as Splat tends to stain unforgivably.
Application is made 1 inch away from scalp because the hair away from the root area receives less natural body heat and will take a little longer to decolorize. Allow color to develop for a minimum of 15 minutes.Do a strand test for color development. (Normal processing time is approximately 30 minutes, but for maximum lightening and gray coverage allow complete development time of 45 minutes.).When desired color is achieved, spray hair with a little warm water and work into lather at the shampoo bowl.pplication is made 1 inch away from scalp because the hair away from the root area receives less natural body heat and will take a little longer to decolorize. Allow color to develop for a minimum of 15 minutes.