Acids of arsenic. Organo-mercury compounds. Batteries. Bristles of boars or hogs. More potent stuff: asbestos; slag dross; ash and residues of incineration of municipal and other waste. Even more harmful: waste oil, black oil. Clinical waste. Plastic waste (among many others, waste and scrap of polypropylene, acrylicpolymers, phenoplast and acetate film scrap). Yarn waste. Ferrous waste and scrap. Scrap and waste of cast iron, stainless steel, tinned iron or steel, tin, zinc, lead waste. Waste and scrap of cobalt, titanium, unwrought cadmium, magnesium. Banned pesticides like DDT and lindane