Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't waste your time or money.

Okay, so we all know red hair is really hard to keep vibrant. Did you know that sulfates in shampoos are what strips the color away so fast? This product is chock full of sulfates, basically contradicting itself completely. If you really want your red to last, try something sulfate free. Also, other than NOT preserving my red, this stuff gave me mad scalp build-up. Would not buy again or recommend.