as polytetrafluoroethylene) that suppresses wrinkles and creates a smooth appearance without ironing. Excess lint or debris may end up on the clothing in between launderings. In such cases, a lint remover may be useful. Once clothes have been laundered and possibly ironed, usually they are hung on clothes hangers or folded, to keep them fresh until they are worn. Clothes are folded to allow them to be stored compactly, to prevent creasing, to preserve creases, or to present them in a more pleasing manner, for instance, when they are put on sale in stores. Certain types of insects and larvae feed on clothing and textiles, such as the black carpet beetle and clothing moths. To deter such pests, clothes may be stored in cedar-lined closets or chests, or placed in drawers or containers with materials having pest repellent properties, such as lavender or mothballs. Airtight containers (such as sealed, heavy-duty plastic bags) may deter insect pest damage to clothing materials as well. Non-iron A resin used for making non-wrinkle shirts releases formaldehyde, which could cause contact dermatitis for some people; no disclosure requirements exist, and in 2008 the U.S. Government Accountability Office tested formaldehyde in clothing and found that generally the highest levels were in non-wrinkle shirts and pants. In 1999, a study of the effect of washing on the formaldehyde levels found that after six months of routine washing, 7 of 27 shirts still had levels in excess of 75 ppm (the safe limit for direct skin exposure). Mending When the raw material – cloth – was worth more than labor, it made sense to expend labor in saving it. In past times, mending was an art. A meticulous tailor or seamstress could mend rips with thread raveled from hems and seam edges so skillfully that the tear was practically invisible. Today clothing is considered a consumable item. Mass-manufactured clothing is less expensive than the labor required to repair it. Many people buy a new piece of clothing rather than spend time mending. The thrifty still replace zippers and buttons and sew up ripped hems, however. Other mending techniques include darning and invisible mending. Recycling It is estimated that 80 billion to 150 billion garments are produced annually. Used, unwearable clothing can be repurposed for quilts, rags, rugs, bandages, and many other household uses. Neutral colored or undyed cellulose fibers can be recycled into paper. In Western societies, used