Lead glass is a type of glass that contains a significant amount of lead oxide, typically around 20% or more. This addition enhances its clarity, brilliance, and weight, making it a popular choice for fine glassware, crystal, and decorative items. The lead content also improves the glass's ability to refract light, giving it a sparkling appearance. Due to its unique properties, lead glass is often used in the production of crystal glassware, chandeliers, and optical lenses. However, it is important to handle lead glass with care, as prolonged exposure to lead can pose health risks.