You are purchasing 100 grams of High Purity, Potassium Iodide crystals. MADE IN USA. This is the best quality Potassium Iodide you will find. Excellent as a Lab Reagent or for any analytical purposes. Intended for lab or scientific use only. NOT intended for food, supplement, or drug use. There are no instructions with this material as Potassium Iodide has many different uses across multiple industries. Bottle will be about half full due to heavy nature of material. Picture may not reflect new GHS labeling. This item is NOT for resale!