This product is a complete waste.
This product is a complete waste of time and money. I ordered 3 bottles. First, I tried the ten minute recommendation. It didn’t touch my gray roots. Then I tried twenty minutes. No change. Finally, I left it on for 45 minutes, using up the entire remainder of the bottle. My gray roots remained untouched. I contacted the company for a refund on the two unopened, still sealed bottles. Because it was past the 30 day mark, they refused to take them back. But they offered me a 15% discount to buy more. As if! On a whim, I tried it one more time, leaving the color on for an hour. My grays are still untouched. This product is trash, and the company is not helpful. I definitely do not recommend!