The dissolving knot is a magic trick done only using sleight of hand and a normal rope.
Monty shows a normal rope to the audience.
Monty ties a magic knot in the middle of the rope.
The magic knot is made very tight so it will knot easily become undone.
Monty performs a magic jester over the magic knot.
Monty wraps his hand around the magic knot and massages it.
The magic knot in the rope gradually disappears dissolves away and completely magically vanishes.