Scouring is a preparatory treatment of certain textile materials. Scouring removes soluble and insoluble impurities found in textiles as natural, added and adventitious impurities: for example, oils, waxes, fats, vegetable matter, as well as dirt. Removing these contaminants through scouring prepares the textiles for subsequent processes such as bleaching and dyeing.[1] Though a general term, "scouring" is most often used for wool. In cotton, it is synonymously called "boiling out", and in silk, and "boiling off.[2][3][4]