HIGHEST PURITY ON AMAZON!! Currently testing at 99.9% (ChemCenter Material Only!) Always bottled… Never bagged! MADE IN USA. You are purchasing 100 grams of pure Potassium Iodide crystals. It is 99.8-99.9% pure minimum always!. This is the best quality Potassium Iodide you will find. For lab or scientific use only. NOT for food or drug use. Picture may not reflect new GHS labeling.