Racking
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THE SOLIDS THAT ACCUMULATED AT THE BOTTOM OF THE VAT WERE CALLED "LEES".

Lees

"...The wine is red... and He pours it out; surely its dregs (or lees) shall all the wicked of the earth drain and drink down" (Psalm 75:8)

The lees are very undesirable for consumption, as this verse indicates through prophecy that the wicked would be judged by having to drink the lees of the wine.

"A feast of wine on the lees" (Isaiah 25:6)

This verse would seem to contradict what was said above.  Be patient until you get to the "aging" page, then it will make sense!

RACKING WAS THE PROCESS OF TRANSFERRING THE WINE FROM ONE VESSEL TO ANOTHER, BEING CAREFUL TO LEAVE THE LEES BEHIND, SO THAT OVER TIME, THROUGH MULTIPLE RACKINGS, THE WINE WOULD BECOME CLEAR.

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Racking

"Moab has been at ease from his youth; he has settled on his dregs, and has not been emptied from vessel to vessel... therefore his taste remained in him, and his scent has not changed." (Jeremiah 48:11)

Sometime after the first of the year, vintners would "stir the lees".  Lees are the spent yeast sediment that settles at the bottom of the vessel during anaerobic fermentation.  Stirring was done to activate any latent yeast to ensure complete fermentation.  Ancient Greeks accidentally discovered that wine aged more rapidly on sea voyages than quietly in a cellar.  The reason was the waves tossing the ship caused the lees to be constantly stirred.

Early on, winemakers discovered that wine left undisturbed would clarify on its own as the lees settled out.  The process of separating the clarified wine from the lees is known as "racking", accomplished by use of a siphon.   Ancient engravings show siphoning or drinking from wine vessels through small tubes.  This grape wine, clarified on the lees and racked, was highly prized and expensive.  The loss of volume by leaving the lees behind was made up by the addition of water ("topping up").  Winemakers discovered that oxidation was reduced by topping up with water to the neck of the vessel (narrower than the body), minimizing the surface area of wine in contact with air.

Notice the racking process described above as taking wine "settled on lees" and "emptying from vessel to vessel".  Ancient winemakers who went to the trouble of aging their wine, recognized the importance of racking.  The end of this verse describes the adverse effect of not racking wine - the taste "remained", that is, the wine took on the bitterness of the lees because it had not been racked.

AFTER WINE WAS SUFFICIENTLY RACKED TO BE CLARIFIED, IT WAS THEN BOTTLED FOR STORAGE.