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Blondes — Add a couple of tablespoons of lemon juice to your rinse water.
Brunettes and Redheads — Add a couple of tablespoons of apple cider vinegar to your rinse water.
Stir 1 teaspoon of honey into 4 cups (1 quart) warm water.
After shampooing, pour the mixture through you hair.
Do not rinse out.
Dry as normal.