1: The bowl for beating egg whites must be wiped clean without water and oil, and the steel wire of the eggbeater should also be wiped clean.
2. Eggs must be fresh, and don't have a little yolk mixed in the egg white when separating.
3: Putting a few drops of white vinegar when beating eggs helps to send away.
4. When putting sugar, put it from the edge of the basin, and don't sprinkle it on the egg white, which will eliminate many bubbles.
My experience is handmade, and I hope to adopt it.