You are buying 500 g of Ultra-Pure Potassium Iodide Crystals (Pic is of a 500-gram bottle). The substance is a granular, coarse crystal with some powder. The buyer bears all responsibility for the usage of this item. The buyer agrees not to hold the seller or Amazon accountable for the item’s use. Buyer undertakes to abide by all local, state, and federal laws when using this item. This is strictly for laboratory and scientific use! NOT FOR USE WITH FOOD OR DRUGS. There are no instructions for this substance since potassium iodide has several applications in a variety of sectors. Due to the hefty nature of the material, the bottle will be around half filled. All USPS rules will be followed when shipping.