Yarn containing excessive oil on its surface, usually from excessive oiling of rings on spinning and twisting machines. Although not visible during carpet production, it may appear as soiled or dark lines of yarn when the carpet is in service. The problem is insignificant in piece-dyed carpet which is washed during the dye cycle, but appears in carpet made from stock-dyed or solution dyed yarn which is not subjected to wet processing after weaving or tufting.
