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Fulling, also known as tucking or walking (Scots: waukin, hence often spelled waulking in Scottish English), is a step in woollen clothmaking which involves the cleansing of woven cloth (particularly wool) to eliminate (lanoline) oils, dirt, and other impurities, and to make it shrink by friction and pressure. The work delivers a smooth, tightly finished fabric that is isolating and water repellent. Well known examples are duffel cloth, first produced in Flanders in the 14th century, and loden, produced in Austria from the 16th century on. Waulking could be done with the hands and feet. In Medieval Europe, it was done in water-powered fulling mills. After the industrial revolution, coal and electric power were used. Felting refers more generally to the interlocking of loose wool fibers; they need not be spun and woven first. Fulling involves two processes: scouring (cleaning) and milling (thickening). Removing the oils encourages felting, and the cloth is pounded to clean it and to encourage the fibers to felt, so in practice the processes overlap. scouring (textiles) Urine was so important to the fulling business that it was taxed in Ancient Rome. Stale urine, known as wash or lant, was a source of ammonium salts and assisted in cleansing and whitening the cloth and having its fibers intertwined. By the medieval period, fuller's earth had been introduced for use in the process. This is a soft clay-like material occurring naturally as an impure hydrous aluminium silicate. Worked through the cloth, it absorbs oils and dirt. It was used in conjunction with wash. More recently, soap has been used. The second function of fulling was to thicken cloth by matting the fibres together to give it strength and increase waterproofing (felting). This was vital in the case of woollens, made from carded wool, but not for worsted materials made from combed wool. After this stage, water was used to rinse out the foul-smelling liquor used during cleansing.

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