This is 1kg of unopened germanium (Ge) powder. Regarding the opened product from the same lot, there was information suggesting "a possible decrease in purity due to oxidation," so we recently had a third-party organization conduct a component analysis. As a result, the germanium content was confirmed to be 95.45% (please refer to the photos). It is believed that the purity may have decreased due to external factors such as oxidation after opening. Since this product is unopened, it has not been affected by such external influences and is believed to maintain the high purity state as stated on the package. Thank you for your understanding. 【Product Overview】 ・Product Name: Germanium (Ge) powder ・Net Weight: 1kg ・Condition: Unopened (stored item) ・Purity: 99% as stated on the package 【Main Applications】 ・Electronic components / industrial materials ・Research and experimental materials ・Materials for crafts / techno art ・Metal collections / asset storage, etc. Germanium / high-purity metal / rare metal / metal materials / experimental materials / semiconductor materials / rare metal / precision component materials / asset storage / rare metal / material for sale / industrial materials / chemical and physical research / material material