To comply with this prohibition, a number of preparation techniques became practiced within traditional Judaism. The main technique, known as "meliḥah", involves the meat being soaked in water for about half an hour, which opens pores. After this, the meat is placed on a slanted board or in a wicker basket, and is thickly covered with salt on each side, then left for between 20 minutes and one hour. The salt covering draws blood from the meat by osmosis, and the salt must be subsequently removed from the meat (usually by trying to shake most of it off and then washing the meat twice) to complete the extraction of the blood. The type of salt used in the process is known as kosher salt.