The silver has been refined in 2 silver electrolysis cells sequentially. The second cell is kept nearly copper free and the concentration of silver nitrate is very high, industry standard is up to 80 grams of copper per liter, my cell is less than 1 gram per liter, also the voltage is kept at 2 volts to ensure the crystals produced are of the highest purity possible. Once the silver crystals are removed from the cell they are rinsed for a total of 6 times with distilled water to ensure all of the electrolyte Is remove, then the crystals are thoroughly baked to ensure all moisture has been removed before weighing them out. The goal in mind is to produce the purest silver possible using an electrolysis cell. This listing is for 1 vial and each vial contains 1 troy ounce and has been carefully measured out to be exactly 31.1 grams or slightly higher to make sure the weight is right. The measurement was made with my scale zeroed out with the bottle on the scale before measuring out 31.1 grams. This highly pure silver shot is ideal for investment or use in various industrial applications. Please contact me if you are interested in larger quantities at a discount and I can see what might be possible.