Stained glass

Stained glass is made of colored glass.

To make colors, makers add bits of metal to hot glass. Copper can make green glass. Gold makes red glass.

Small pieces are held by strips of lead. These pieces make big pictures in windows. These windows can show stories or patterns. They look like bright wall art.

It is a very old and beautiful art.

Stained glass is a beautiful art made of colored glass.

Artists make colors by adding metal powders to hot, melted glass. Cobalt makes a deep blue. Copper can make green or a bright red.

To make red glass that is not too dark, makers use flashed glass. This is a thin layer of color on clear glass.

Making these windows takes great skill. Artists must design the art. They also need to be engineers. The glass must fit the space well. It must also stand up to wind and rain. Small pieces are held together by strips of lead called cames.

Some artists also paint on the glass. They use a dark paint called grisaille to add lines.

These windows do more than let in light. They control it to decorate walls. In old churches, they show stories from the Bible. In homes, they might show plants or animals. This art has lasted for hundreds of years.

Stained glass is a beautiful art made from colored glass.

It can be used for flat windows or even 3D sculptures. People often use the term to describe colorful glass objects like lamps.

These works do more than just let light into a room. Instead, they are meant to control the light. Some people call them "illuminated wall decorations." They can show many things. A church window might tell stories from the Bible. A college hall might show figures of science. A home window might show plants or animals.

Making these pieces requires both art and engineering skills. An artist must first dream up a workable design. Then, they must build a piece that fits its space perfectly. The glass must be strong enough to hold its own weight. It also must resist wind and rain. To make a window, artists arrange small pieces of colored glass. They hold these pieces together using strips of lead called cames. These strips are supported by a rigid frame. Artists also use silver stain to add yellow colors. They might use a dark paint called grisaille to add black lines. This paint is a mix of glass powder, iron, and clay. It is painted on and then fired in a kiln.

Glassmaking has a very long and interesting history. In the Late Middle Ages, many large windows were made. Many of these have stayed intact for hundreds of years. In Western Europe, these windows are a major form of art. They are often studied alongside old, decorated books called illuminated manuscripts. Different cultures have added to this history. From the 8th century, Islamic civilization helped grow this art. They used science in chemistry and optics to improve it. Glassmakers in Syria and Egypt developed new ways to color and decorate glass. Syrian glass is known for beautiful floral and geometric designs.

Creating the glass itself is a very hot job. Makers start with a material called silica. They must melt it at a very high temperature. To help it melt, they add things like potash or soda. To make colors, they add metal powders to the molten glass. Cobalt makes a deep blue color. Copper can make green or a bright red. Gold can make violet or wine-red glass. Sometimes, makers use a method called flashed glass. This is a thin layer of color on clear glass. This is helpful because deep red glass can look black if it is too thick.

There are many ways to shape the glass. One way is called the crown technique. A maker blows a bubble of glass and then spins it very fast. This makes the glass flatten out into a sheet. The center stays thicker and is called a "bull's-eye." Another way is called rolled glass. This involves pouring molten glass onto a table and rolling it with a cylinder. This method began being made for stores around the mid-1830s. Today, many countries still make high-quality glass. This includes Germany, France, England, and the United States. Modern artists still learn from the traditions of the past.

Stained glass is both a beautiful art form and a complex architectural material. It refers to colored glass used in artistic works or structural pieces. While most people think of flat window panels, modern artists also create three-dimensional sculptures. The term can even describe domestic items, such as the famous lamps made by Louis Comfort Tiffany.

Beyond simple decoration, these works serve a specific purpose in building design. They are often called "illuminated wall decorations" because they control light rather than just letting it in.

Creating a functional window requires a mix of artistic vision and engineering precision. An artist must conceive a design that is actually workable in glass. The finished piece must fit snugly into its designated space. It also has to withstand environmental pressures like wind and rain. For very large installations, the window must be strong enough to support its own weight. Many large windows from the Late Middle Ages have remained intact for centuries due to these careful construction methods.

To build a window, small pieces of colored glass are arranged into patterns or pictures. These pieces are held together by strips of lead known as cames or calms. The entire assembly is then held by a rigid frame. Artists often add extra detail using painted elements. They might use silver stain to create yellow colors. To define shapes and add shading, they use a dark mixture called grisaille paint. This paint contains powdered glass, iron or rust filings, clay, and a binder like gum arabic. The glass is then fired in a kiln to fuse these details to the surface.

The glass itself begins as a molten mixture of silica. Because silica requires extremely high temperatures to melt, makers add potash, soda, or lead to lower the melting point. They also add lime to make the glass more stable. Color is introduced by adding metallic oxide powders while the glass is molten. For example, cobalt creates a deep blue, while copper oxides produce green or bluish-green shades. Gold can produce violet or wine-red glass. However, modern red glass often uses copper because it is less expensive and provides a bright, vermilion shade.

There are two primary ways to color the glass: pot metal and flashed glass. Pot metal glass is colored all the way through the sheet. This happens when the color is mixed directly into the clay pot in the furnace. Flashed glass is a different technique used to solve a specific problem with red glass. If red glass is made at a standard thickness of 3 mm, the color is so intense that it looks black. To fix this, makers laminate a thin layer of red glass onto a thicker piece of clear or lightly tinted glass. This "flashing" allows light to pass through while maintaining a rich color. Artists can also engrave or abrade flashed glass to reveal the clear layer underneath.

Glassmakers use several methods to turn molten globs into flat sheets. In the cylinder or "muff" method, a maker gathers molten glass on a blow-pipe and blows an air bubble. They use tools, gravity, and water-soaked wooden molds to shape it into a long cylinder. Once the desired size is reached, the cylinder is cut, heated, and flattened. Another traditional method is crown glass. A maker blows a bubble and spins it rapidly on a table. Centrifugal force flattens the bubble into a disk. This process leaves a thick center called a "bull's-eye" and a distinctive pontil mark.

Historically, different civilizations have advanced the craft of glassmaking. From the 8th century onward, Islamic civilization played a major role in the development of stained glass. Through scientific progress in chemistry and optics, Islamic glassmakers turned the craft into a large-scale industry. They produced glass vessels in massive quantities by blowing liquid glass in chambers. In Syria and Egypt, artisans developed unique techniques for coloring and decoration. Syrian stained glass is particularly famous for its intricate geometric and floral designs. This tradition of excellence continues today in factories across Germany, the United States, England, France, Poland, Russia, and Syria.