I just made my coffee (dark roast). I put 2 cups in a measuring cup and let it cool. I shampood my hair regularly with Aphogee for damaged hair, 2xs. Then I poured the coffee over my hair. I then sealed it with Profective Mega Growth conditioner for 10 minutes. My scalp did start to tingle
Then I rinsed it out and went about my regular regimen (leave-in, heat protectant, etc). My hair is currently dry, smells like coffee, and has that swang. I've not put on any more product on my hair yet, and i still feel my scalp tingling. No lie (if I were a girl scout, I'd say 'girl scout's honor).
ETA: DH was staring at me and my measuring cup of coffee and walked out.