What's new at The Loft - Episode 70

Macro 3.6.5. Challenge

Stained Glass Butterfly Wing

Taken on my camera phone

The term stained glass can refer to coloured glass as a material or to works made from it. Throughout its thousand-year history, the term has been applied almost exclusively to the windows of churches and other significant buildings. Although traditionally made in flat panels and used as windows, the creations of modern stained glass artists also include three-dimensional structures and sculpture.

Modern vernacular usage has often extended the term "stained glass" to include domestic leadlight and objects d'art created from lead came and copper foil glasswork exemplified in the famous lamps of Louis Comfort Tiffany.

As a material stained glass is glass that has been coloured by adding metallic salts during its manufacture. The coloured glass is crafted into stained glass windows in which small pieces of glass are arranged to form patterns or pictures, held together (traditionally) by strips of lead and supported by a rigid frame. Painted details and yellow stain are often used to enhance the design. The term stained glass is also applied to windows in which the colours have been painted onto the glass and then fused to the glass in a kiln.

Stained glass, as an art and a craft, requires the artistic skill to conceive an appropriate and workable design, and the engineering skills to assemble the piece. A window must fit snugly into the space for which it is made, must resist wind and rain, and also, especially in the larger windows, must support its own weight. Many large windows have withstood the test of time and remained substantially intact since the late Middle Ages. In Western Europe they constitute the major form of pictorial art to have survived. In this context, the purpose of a stained glass window is not to allow those within a building to see the world outside or even primarily to admit light but rather to control it. For this reason stained glass windows have been described as 'illuminated wall decorations'.

Glass factories were set up where there was a ready supply of silica, the essential material for glass manufacture. Silica requires very high heat to become molten, something furnaces of the time were unable to achieve. So materials needed to be added to both modify the silica network to allow the silica to melt at a lower temperature (potash, soda, lead), and then to rebuild the weakened network (lime) and make the glass more stable. Glass is colored by adding metallic oxides while it is in a molten state. Copper oxides produce green, cobalt makes blue, and gold produces red glass. Much modern red glass is produced using copper, which is less expensive than gold and gives a brighter, more vermilion shade of red.

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