The riddling desk is used during sparkling wine production. The bottles are initially placed in the desk almost horizontally. Over a period of one month, the bottles are slowly turned and moved into a more and more upright position. All of this is done by hand. Once, the bottle is placed in the riddling desk upside down, the riddling pocess is over. All the yeast in the bottle has sunk into the bottle neck and the wine can now be disgorged.