Artificial methods Edit. For crystallization (see also recrystallization) to occur from a solution it must be supersaturated. This means that the solution has to contain more solute entities (molecules or ions) dissolved than it would contain under the equilibrium (saturated solution).
Yep, good old water will instantly tighten your skin if it is cold enough. Fill a basin with half ice and half water. Submerge your face for about 10 seconds and pat dry. You skin will take on a pink hue and your pores will be closed. You can also use this trick to dry nail polish instantly.
The heat in a paraffin wax facial opens the pores of your skin. This is because the heat causes you to sweat, which loosens the dirt and grime in your skin. This loosening allows you or the esthetician to remove stubborn black and white heads. The warmth from the paraffin wax makes the blood vessels in your face expand.