Chemicals whose toxic properties are commercially exploited in agriculture, industry, or commerce to increase quantity, improve quality, or generally promote consumer acceptability of a variety of products. Common types include insecticides, rodenticides, herbicides, defoliants, fungicides, insect repellents, molluscicides, and some kinds of food additives. The wide variety of poisons commonly found in and around the home constitutes ail important source of accidental poisonings.