Glass additives are elements or molecules added to glass in order to improve its properties. The properties glass additives can improve include color, durability, thickness, conductivity, elasticity, refraction index and stability. Nanoparticles, metal alloys, polymers are types of glass additives. The applications of glass additives include glass transition, silicate glass manufacturing, aerodynamic levitation, network glasses, 3D printing, color strengthening and others. Glass additives are also used for customization of glass for different applications including tableware, lamps, and eye glasses among others. The basic chemical elements used as glass additives include iron, sulfur, manganese, chromium, nickel, titanium, uranium and other rare earth metals. Metal additives are specially used to change the color and conductivity of glass for specific applications.