Older windows made of stained glass have a great deal of texture. They are lumpy, and many of them have small air holes. This may appear to be a case of glass being made improperly. When stained glass was first made, the glass mixtures were heated in wood-fired kilns. There was very little control over the temperature, and many times it was insufficient to melt all the glass ingredients. While there are minerals, such as alumina, that reduce the heat necessary to melt glass, these were not known to artists of the time. Completely melting glass in these ancient kilns was a hit or miss procedure that produced glass with character rather than perfect plates of glass.

Stained Glass

Why Cathedrals Have Stained Glass Windows

There is no one person who is credited with the invention of stained glass windows. The Romans were great collectors...

Stained Glass

Leaded Stained Glass Windows

Stained glass windows are traditionally made with lead to hold the glass pieces in place. Today, lead is considered a...

Stained Glass

Cartoons for Stained Glass Windows

When the word cartoon is used, many people think of animated movies or television shows. That is the modern usage...