《周礼·冬官考工记·筑氏&玉人》
荒氏湅丝，先把丝放在温水中浸泡七天，再离地一尺曝晒，白天在太阳下暴晒，晚上悬浸在井水中过夜，经过七天七夜，这就叫做水湅。
荒氏湅丝，以涚水沤其丝七日，去地尺暴之。昼暴诸日，夜宿诸井。七日七夜，是谓水湅。
The Huang clan degums silk by first soaking it in warm water for seven days. Then, they expose it to the sun one foot off the ground. During the day, the silk is sun-dried, and at night, it is hung in well water overnight. This process is repeated for seven days and nights, which is called water degumming.