Tiffany
'Painting' with the Tiffany technique
Windows made using this technique are lighter than stained-glass windows, but Tiffany work is not weather-resistant and therefore cannot be placed outdoors.
With the Tiffany technique, you can create not only windows, but also window hangings, freestanding objects, and jewelry. Because copper foil is used here instead of lead, you can work more finely, allowing you to, as it were, paint with glass. So, that is not mandatory; it is an option.
Exterior windows
Exterior windows can also be made using the Tiffany technique, such as the windows in the photo on the right. However, since Tiffany work is not weather-resistant, the windows must be fitted with double glazing in that case.

