Instruct: Classify the given review as either positive or negative.
Query: Bluest Black Yet

This is the third "Blue Black" I've tried and it is my favorite.I'm looking for blue blue blue black.Easy to use; 30 min black (Mohawk) on top, 10 min on the sides to turn my grays blue.Cream formula is more home user friendly than straight NH4OH/peroxide dyes, a little more expensive ($10).Sealant conditioner seems good quality too.