Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Gentle, but takes longer than other products.

I've used Clairol BW2 to bleach my brown hair to a very light and sometimes platinum blond for many years. I gave Quick Blue a try after reading all the positive reviews here.I've used it now at least four times and I would say it seems quite gentle on your hair but it takes longer to lighten than BW2.I always use 40% developer and it takes 3-4 times at 1 hour each to get light enough to where I can then tone remaining light yellow out.Giving it 4 stars, as yes, it works great and it's gentle. However, I prefer the speed of BW2. I'm a guy with short hair and am not that concerned with damaging my hair like most. I just want it done quickly so I don't have to spend all day bleaching. :)