When a concentrate is used to color a natural base resin, be sure to use a concentrate that matches up with the base resin. Although there are concentrates thatcan be used across different materials it is critical to make sure that the concentrate is intended for the desired material. Communication with the concentrate supplier will help resolve potential issues with using the wrong color concentrate. Also be sure to clearly document the bill of materials for a part so that everyone can quickly see what the base material is as well as the specific color concentrate to be used.