Handmade window glass
Handmade window glass is used when something extraordinary is required, for example in restorations and art projects. Architect I.M. Pei did not like to use ordinary green glass for the glass pyramids at the Louvre in Paris. Glass with less iron (a colouring impurity) was specially melted for the purpose and poured into great slabs. After cooling the slabs were then cut and polished on both sides by Saint-Gobain, a well renowned French glass manufacturer. The exact same method was used to make the mirrors for 'Galerie des Glace' at Château des Versailles several hundred years preceding.