First find a round (no round square is OK) transparent bowl or cup, the caliber should be able to cover the jade dew or the whole jade dew basin. It's OK to find a small lunch box which is usually used to pack rice after eating fast food outside!
Cover the transparent cup on the jade dew. It's better to cover it tightly. Because my one was planted in a square basin, it's not easy to keep it stuffy, so I used two transparent bowls, plus plastic bags to cover it tightly. First put Yulu in the big transparent bowl.
Then cover it with a small bowl, and there will be a big mouth in the middle.
So only use a transparent plastic bag to cover it tightly.
The jade dew from the stuffy cultivation is crystal clear and bright in color.