A mordant or dye fixative is a substance used to set plant dyes on fabrics. It is widely known that there are some mordants that are toxic to the environment. We only use mordants that are non toxic to expel, and not harmful to the person wearing a naturally dyed garment. Some of our mordants come from plants. We are in the process of researching how our exhausted dye baths could be used as a natural agricultural fertilizer.