Used as a white pigment in paints, especially in primers and anti-corrosive coatings due to its excellent opacity and adhesion properties. It provides good durability and resistance to weathering, making it suitable for protecting metal surfaces like bridges and industrial structures. Historically used in artist paints and varnishes, but its use has declined due to toxicity concerns. Also found in some specialized coatings for marine environments where long-term protection is required. Its reactivity with acids limits use in high-acid environments. Handling requires strict safety controls to prevent inhalation or ingestion of dust.