Name the melon seed packaging bag

After the black melon seeds bought from a melon seed factory in Jiyang County were soaked in warm water, the water quickly turned brown. What is added during processing to turn melon seeds from pale white to shiny? The living room and bedroom of the house are the packaging workshops. Black melon seeds packed in woven bags are piled aside. Some of the melon seeds have been packaged. Furniture, daily necessities and melon seeds are mixed together. After calling the "Zhenxin" melon seed factory, the relevant person in charge said that the packaging bags used by the melon seed factory in Jiyang County