Color (Non-white) is a technical term in feather & down industry. It refers to the proportion of non-white plumages that existed in the entire batch, which is also called the “Black Spot”. Black spots are natural marks existed in mature goose and duck plumages (except some color marks made by breeders). Black spots don’t mean inferior quality or impurity, actually they are the symbol of mature down with high quality. It doesn’t affect the fill power or insulation ability. There is no 100% pure white goose down in the world. However, most of the down beddings and some down jackets are using white or light color fabric. In that case, the volume of black spots is required to be kept as low as possible. Generally black spots can be eliminated by hand but comes with low efficiency and high cost. Some factories use the machine to pick the black spots, yet both the efficiency and cost are unsatisfied.