Most Remy hair can be dyed. If the hair is truly Remy hair then the hair should be fine. The methods and length of time may differ from each company. There is a chance the hair may not be perfect the first time. Sometimes it may take 2-3 times for best results. Always do a strand test first. If hair is 100 percent human hair then it should dye with no problem. Learn more about Remy hair.