Refers to brownish impurities that are in unbleached and untreated fibres and woven cloth, within all vegetal fibres but especially in raw state cotton, and wild silks. The ‘impurities’ are small pieces of the cotton boll, silkworm cocoon, or stems of leaves that have been caught up in the spinning process and which become an inherent part of the woven or knitted cloth.
Surface marks, usually dust of some sort may come with raw fabrics; these are easily removed by washing.