Chemical hazards typically found in laboratory settings include carcinogens, toxins, irritants, corrosives, and sensitizers. Unlike corrosives, substances defined as irritants cause only reversible skin damage. Some corrosives possess other chemical properties which may extend their corrosive effects on living tissue. Colloquially, corrosives may be called "poisons" but the concepts are technically distinct. Float sensors operate well in a wide variety of liquids, including corrosives. He is largely able to withstand corrosives, punctures and concussions without sustaining injury. Typhoid fever, non-steroidal anti-inflammatory drugs, ingestion of corrosives may also be responsible. Once used, corrosives are most often recycled or neutralized. Medical gloves offer some basic protection against corrosives and surface contamination. Fiberglass mesh can also be used in mold making and as protection against corrosives.