Dernoo Germanium Co., Ltd (Dernoo), headquarter in Nanjing, Jiansu province, China, Dernoo was established on 2006. We are a global supplier of Germanium serious product which included Germanium dioxide, Germanium tetrachloride, Zone-refined germanium ingots, organic germanium and infrared germanium parts used in optical fields, whether they are standard or custom products. Dernoo takes quality issues very seriously. We know the importance of quality to the customers very well. All of our products been inspected very seriously before delivery. We take every order very seriously to ensure the quality and lead time that we promised on the quote because we respect long-term relationship and &＃039;win-win&＃039; strategy. Dernoo hope to work closely with you to supply products to meet your requirements.