Eye: May cause irritation. Chalk dust is discomforting and abrasive to the eyes. Skin: Prolonged skin contact may cause irritation. When the product is used as intended, it is unlikely to cause discomfort. Ingestion: Ingestion of large amounts may cause gastrointestinal irritation. Ingestion is considered an unlikely route of entry in commercial or industrial environments. Inhalation: May cause respiratory tract irritation. When the product is used as intended, it is unlikely to cause discomfort. Chronic: Repeated and prolonged inhalation exposure to crystalline silica dust above exposure limits may cause delayed, chronic lung injury (silicosis). When the project is used as intended, dust levels should not exceed exposure limits. See Sections 8 and 11.