A sealed ampoule of dry Chlorine gas.  Purity is 99%.  The pale yellow color of the gas is clearly visible, especially against a white background.  Sorry no international shipping (International buyers, your order will be cancelled if it contains this item or any one of the following: Arsenic, Cesium, Bromine, Gallium, Lithium, Mercury, Potassium, Rubidium, Sodium, Thallium, Thorium, Uranium, Amorphous Phosphorus, White Phosphorus or the Complete Element Set)