Hi EarlyTwenties,
When dying a hair system you need to be careful not to get the dye on the lace. If you do it will stain the lace. It's important to use only small amounts of dye so that it doesn't run onto the lace. Some people who are not careful prefer to pin the hair system to a styrofoam head, turn it upside down, and them dye the hair so that any excess dye runs downward (away from the base) onto newspaper below. So dying your own hair is easier.
Regards
John