After the envelope has been chilled, the flap may be easier to lift carefully. With patience, you might be able to slide a finger or a dull tool underneath and open it slowly.
However, this method is not guaranteed. Modern self-adhesive envelopes often use stronger glues that are unaffected by freezing, and some envelopes may still tear.
The trick is not a magical solution that reverses every mistake. It simply takes advantage of how certain materials react to cold.
Sometimes you get lucky and open the envelope cleanly. Other times, the paper tears and you have to start again with a new envelope.
The real lesson is that small mistakes happen, but many problems have possible solutions. Sometimes a little patience and knowledge can give you another opportunity to fix things.
