Publisher Summary Chemicals vary from commodity substances in bulk to household cleaning products in small packages. Mixtures of chemicals, such as formulated products, are usually termed “preparations”, which constitute 95% of commercially available dangerous chemicals. If a chemical is hazardous, it should be first classified into an appropriate category of danger to assist in the provision of the correct information and packaging. Manufacturers, suppliers and importers of all chemicals have a legal obligation to ensure that their products are fit for use, properly packed, labeled and transported, and to provide the user with information on the hazards and precautions to ensure they can be used safely and without harm to the environment. The hazards of dangerous substances, as opposed to dangerous preparations, must also appear in advertisements for those chemicals.