WARNING! Cancer Hazard. Contains quartz (crystalline silica) which can cause cancer. Risk of cancer depends upon duration and level of exposure to dust. Not an acute hazard. Prolonged inhalation of dry glaze dust may cause lung injury. Inhalation of high concentrations of dry glaze dust may cause mechanical irritation and discomfort of the (respiratory tract). Repeated exposure may cause chronic effects. Wear a N-95 face mask when cleaning up dry glaze dust. WARNING! May be harmful if swallowed. Inhalation of extremely high concentrations of copper compounds could cause pulmonary edema. Prolonged or repeated overexposure to copper salts may cause kidneys, liver and blood system effects. Prolonged or repeated contact of copper salts with skin may cause dermatitis. Avoid fumes from firing. WARNING! Cancer Hazard. Nickel oxide may cause cancer by inhalation. Prolonged inhalation of Nickel oxide may cause serious damage to health. May cause sensitization by skin contact. *Glaze in liquid form poses no health risk. Inhalation of dry glaze dust, fumes from firing or ingestion of glaze should be avoided.