Her great grandmother did this. When she died she didn't have a gray hair. Teabagging your hair! Blondes: Chamomile; Red: Rooibos; Brunette: Black. Once a week, steep 2 tea bags in 2 cups boiling water for 10 minutes. Let the liquid cool to room temperature. Pour the mixture over wet, just-washed hair, rubbing it through the way you would shampoo. Leave the rinse on for 10 minutes; wash and condition to seal in the silky, glossy results.
You will surprised to see all the makeup that is left in the water. How to properly clean your makeup brushes. (a tablespoon of white vinegar in a cup of hot water, and a 20 minute soak, followed by a hot, then cold rinse and pat dry will do it. Disinfects, dissolves grease/makeup, leaves no film, and inexpensive.)