The sources of dangerous chemicals in schools are not always obvious. This guidance applies to any school that purchases, uses, stores, or disposes of chemicals or products containing dangerous materials. Some of the most common dangerous chemical products in schools include: Laboratory chemicals (e.g., acids, bases, solvents, metals, salts); Industrial arts or shop classes (e.g., inks, degreasers); Art supplies (e.g., paints, photographic chemicals); Pesticides, fertilizers, and de-icers; Maintenance supplies and equipment (e.g., drain cleaners, floor stripping products, paints, oils, boiler cleaners, fuels, mercury switches and gauges); Health care equipment (e.g., mercury thermometers).