◆ This is iron sand collected from the coast of the Sanin region. The iron sand has been purified by collecting it with a magnet, but some sand (such as quartz grains) is mixed in. There is over 200g excluding the weight of the bag, so I believe there is at least 200g of iron sand even after removing the impurities. It was collected with the thermite reaction experiment in mind, but this level of purity is sufficient for this experiment. ※ We try to ship within 24 hours of purchase, but shipping may be delayed depending on circumstances, so we have set the shipping time to "4-7 days". ※ If you are in the education field or similar and would like a discount, please send a comment. ※ I also have a considerable amount of "iron sand mixed with sand" before collecting the iron sand with a magnet, so if you need it, please request it in the "comments". ※ Reference Many people seem to think that "iron sand = iron powder," but iron sand is "iron oxide," a substance in which iron (Fe) is combined with oxygen (O). Therefore, if you remove the oxygen (O) bound to the iron oxide, you can obtain iron (reduction reaction). When you mix iron sand (= iron oxide) with aluminum powder and ignite it, it reacts violently and becomes very hot (thermite reaction). At this time, the oxygen (O) separates from the iron sand (reduction reaction) and transfers to the aluminum. Then, the molten iron solidifies and an iron mass is obtained. Please search for keywords such as "thermite reaction experiment."