2, egg yolks and egg whites are separated cleanly:
Generally speaking, we are whipping the egg whites, only the yolks and whites separated cleanly in order to completely whipped.
If the egg yolk remains in the egg white, it is difficult to whip thoroughly in this case, because the yolk contains certain ingredients that are difficult to decompose.
3, the use of tools to be free of oil and water:
Normally, a little droplet of water does not matter, but there can not be any grease, because grease has a greater impact on the whipping of egg whites.
It is important to understand that it is easier to whip eggs at room temperature than when they are refrigerated, but refrigerated eggs are whipped and the whites are more stable.