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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.
To get a mottled effect, you can use the old tie-dye method. Leave your fabric in the dye anywhere from 20 minutes to one hour. If it is still not dark enough, return it to the dye bath. Remember your fabric will be a lighter colour when dry. Use your hairdryer on a corner of your fabric to check it, and return it to the dye bath if it's not dark enough. To set your colour, add 1 teaspoon of alum to the dye bath. Leave the fabric sit for 5 minutes. It is always best to do test swatches when doing your own dyeing.