Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Pravana is the best shampoo you can buy!

I have been using Pravana sulfate-free color ensure shampoo for several years now. We cannot find it in the Albuquerque area, so I have to call my daughter who lives in Pennsylvania and ask her to mail me a bottle.Now, with Amazon, I can get as many bottles as I want, as often as I want, and do not have to bother my daughter at all. Rest assured, this is the very best shampoo for you if you color your hair. I also use the Pravana sulfate-free conditioner. I am a redhead and everyone knows how quickly red hair becomes a very ugly almost gold color. Not with Pravana. My red hair stays the exact same color throughout many washings. That is probably because it is sulfate-free.Buy Pravana if you color your hair. You certainly will not be disappointed at all.