No, we don’t use optical brighteners in our ECOS laundry detergents. Optical brighteners are artificial (or synthetic) ingredients that are often added to laundry detergents to make laundry look “brighter.” They do this by leaving a pigment (like a dye) on the fabric’s surface. This is not only damaging to delicate clothes, but it’s also bad for the environment. Optical brighteners aren’t biodegradable formula and are often toxic to aquatic ecosystems.