Thinking of coloring your hair with a temporary color? If your hair is chemically treated, temporary colors may not wash out. Always do a test strand, even with temporary colors to see if they will, if fact, wash out. If your hair is porous, dry, or damaged, haircolor can stain and not completely wash out, even if the box says it will only last a few shampoos. Save yourself a lot of grief by doing a strand test before doing any color application.