Mercury (element) used in teething powders for infants. The mercury-containing organohalide merbromin (sometimes sold as Mercurochrome) is still widely used but has been banned in some countries such as the U.S. Mercury and most of its compounds are extremely toxic and must be handled with care; in cases of spills involving mercury (such as from certain thermometers or fluorescent light bulbs), specific cleaning procedures are used to avoid exposure and contain the spill. Protocols call for physically merging smaller droplets on hard surfaces, combining them into a single larger pool for easier removal with an eyedropper, or for gently pushing the spill
Substantial equivalence been used in various fields of science and technology. The OECD bases the substantial equivalence principle on a definition of food safety where we can assume that a food is safe for consumption if it has been eaten over time without evident harm. It recognizes that traditional foods may naturally contain toxic components (usually called antinutrients)—such as the glycoalkaloids solanine in potatoes and alpha-tomatine in tomatoes—which do not affect their safety when prepared and eaten in traditional ways. The report proposes that, while biotechnology broadens the scope of food modification, it does not inherently introduce additional risk, and therefore, GM