Cover Your GrayEvolve Perf Hair Color Touch-up Stick - Medium Brown

Q: Is this stick better than the wand or powder?

I never tried the other products. The stick works but is sticky

Q: What is the color difference between black and jet black?

I'm not sure of the answer, I believe Jet Black is darker than Black. I use Dark Brown so not familiar with the other colors. Cover Your Gray Stick is a great product that I have used for several years.

Q: Does this product work on African American hair (edges)

I wish I could answer your question. I do not have African American hair. My guest would say yes, as I use it on my scalp & that should work on all types of hair. Hope that helps with your question.