Coloring Hair With Coffee Grounds. You can make almost any hair color darker with coffee grounds. hair being porousenough to allow the water-based transfer of tinting into the hair. Coffee is dark in color, so it acts as a stain on the hair.
Brewed ground beans and instant coffee granules may temporarily stain your hair a dark brown. One can also use the coffee hair dye which can further darken the color of hair in a bid to change one's look. I dye my hair with coffee!!!
Mix half of the coffee with two to three tablespoons of coffee grounds (to thicken and darken the mixture).
Then apply it to clean, damp hair and let it sit for at least an hour.
Most hair colours contain chemicals that can damage your hair making it look lifeless, dull and damaged. Reviewers are raving about this dye, saying "this is a fast and easy product to use" and "my favorite part was how healthy my hair felt and stayed after use." A: You can indeed make brown hair dark with coffee grounds. But a stronger cup of coffee hair dye will help you achieve a darker coffee-tinted look.