Contains Magnesium Nitrate, Magnesium Chloride, and a mixture of Isothiazolinones (5-chloro-2-methyl-2H-isothiazol-3-one and 2-methyl-2H-isothiazol-3-one). Physical Properties: Appearance: Clear light yellow liquid. 2.0 – 5.0 (neat). Solubility: Completely soluble in water. files.dep.state.pa.us Handling and First Aid Personal Protective Equipment (PPE):