EMERGENCY OVERVIEW: Product Description: These products are colored, finely powdered, odorless chalks. Health Hazards: Inhalation of dusts from this product may irritate the respiratory system. Skin and eye contact may cause mechanical abrasion. These chalks contain Crystalline Silica, a known human carcinogen by inhalation. Flammability Hazards: These chalks are not flammable. Finely divided dusts from these products can form explosive mixtures in air. If involved in a fire, these products may decompose to form iron oxides, aluminum oxides, silicon dioxide, sulfur dioxide, magnesium oxides, carbon oxides and calcium oxides. Reactivity Hazards: These chalks are not normally reactive. For the Blue Chalk, contact with acids can release toxic hydrogen sulfide. Environmental Hazards: These products are not expected to pose significant harm to the environment, however all release to the environment should be avoided. Emergency Recommendations: Emergency responders must wear the personal protective equipment suitable for the situation to which they are responding.