The toxic element commonly used in old paints and pipes is lead. For many years, lead was widely utilized in paint formulations for its durability and ability to enhance color. However, it became evident that lead is highly toxic, especially to children, leading to serious health issues including developmental delays. Additionally, lead was often found in plumbing pipes, posing a risk of contamination in drinking water. Due to its harmful effects, the use of lead in consumer products has been heavily regulated or banned in many countries, prompting a shift to safer alternatives.