Isabella Flores
Stained glass is an ancient art form that has existed for millennia, with evidence of its use dating back to the Ancient Roman Empire. The creation of stained glass involves a time-consuming and intricate process that combines craftsmanship and artistry. While the techniques have evolved over time, the fundamental principles of stained glass making remain unchanged since ancient times. This evolution can be observed in the methods used for painting and firing stained glass, which were influenced by cultural shifts, religious beliefs, and technological advancements.
| Characteristics | Values |
|---|---|
| Basic ingredients | Sand and wood ash (potash) |
| Coloring agents | Metallic oxides, powdered metals |
| Colors | Green, blue, purple-red, brown, black, dark brown, dark red, gold, yellow |
| Techniques | Slab glass, dalle de verre, gemmail, cement tracery, masonry technique |
| Tools | Pontil iron, H-shaped strips of lead (cames), iron frame (armature) |
| Artists | Jean Gaudin, Pierre Fourmaintraux, Dom Charles Norris OSB, Jean Crotti, Picasso, John Hayward, Adolfo Winternitz |
| Ancient examples | Lycurgus Cup, Portland vase, Augsburg Cathedral, St. Paul's Monastery in Jarrow, England |
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What You'll Learn
Techniques for painting on stained glass
The process of painting on stained glass involves a variety of techniques and has been admired since ancient times. Here are some techniques for painting on stained glass:
Preparation
Before painting on stained glass, it is important to ensure that the glass is clean and free of any dirt or grease. This can be achieved by cleaning it with alcohol. Additionally, it is recommended to work in a climate-controlled space, as cold glass can be difficult to cut.
Priming
Professional glass painters often prime the glass before starting their artwork. They apply a light layer of paint known as an "undercoat" to the glass surface. This provides a suitable surface for the subsequent painting, making it easier to trace and shade.
Painting Techniques
When painting on stained glass, the consistency of the glass paint is crucial. The paint should be runnier than that used for line work, creating a delicate wash. It is recommended to dilute the paint with water and test it on a light box for depth of colour. Use a mop brush at a 45-degree angle to apply the paint in continuous lines across the glass surface. Work quickly, as the paint will start to dry, and blend it before it dries for an even coverage.
Stippling
Once the initial wash is dry, you can create a stippled effect by tapping into the paint surface with the tip of a badger brush. This technique breaks up the paint, allowing pinpricks of light to penetrate, resulting in a unique visual effect.
Texturing
To create textures, you can experiment with various tools such as bubble wrap, needles, sticks, cotton wool, netting, combs, and sponges. These tools can be used to create different marks and textures on the paint surface, adding depth and interest to your artwork.
Firing
After painting, the glass is typically fired in a kiln. The firing process involves heating the glass at specific temperatures and rates to achieve the desired finish. Different techniques and kiln types will require adjustments to the firing schedule. It is important to test the firing process in your own kiln to ensure optimal results.
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Firing stained glass painting
Firing stained glass is an ancient art form that has been used to create decorative and informative pieces, particularly in churches and other religious buildings. The process of firing stained glass involves applying paint to the glass and then heating it to permanently fix the design.
The first step in creating a stained glass piece is to cut and shape the glass into the desired form. This can be done by blowing molten glass into a sausage shape and then slitting and flattening it into a sheet, or by spinning it with a pontil iron to create a round sheet. The artist then paints the design onto the glass using various techniques, such as solid lines, shading, or fine details like shadows and outlines, using paint that is typically an oxide of lead in dark colours like black, brown, or red.
Once the painting is complete, the glass is fired in a kiln to permanently fix the paint to the glass. This process involves heating the glass to a high temperature, causing the paint to fuse with the glass. The specific temperature and duration of the firing process depend on the type of glass and paint being used. After firing, the glass may be coated with a light layer of paint to reduce the amount of light passing through, creating a softer effect.
In the early 19th century, French stained glass artists extensively painted and fired large panes of glass, often copying designs directly from famous oil paintings. This period saw a great demand for stained glass to restore ancient buildings, particularly in Germany and France. Artists during this time also began experimenting with different techniques, such as slab glass set in concrete or epoxy resin, and overlapping pieces of glass without using lead cames, allowing for greater colour diversity.
The firing process is an essential step in creating stained glass art, ensuring the permanence and durability of the design. This ancient technique continues to be used and adapted today, combining traditional methods with innovative approaches to create modern stained glass installations.
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Ancient stained glass painting in Europe
The art of stained glass in Europe reached its peak between 1150 and 1500, when magnificent stained-glass windows were created for great cathedrals. Most of what we know about medieval stained-glass making comes from a 12th-century German monk and metalworker who called himself Theophilus. In his text, 'On Diverse Arts', Theophilus described how he carefully studied glaziers and glass painters at work, aiming to create windows of "inestimable beauty".
The basic ingredients for making glass are sand and wood ash (potash). The mixture is melted into a liquid, which, when cooled, becomes glass. To colour the glass, certain powdered metals are added to the mixture while it is still molten. For example, adding copper oxides to molten glass will result in green and blue tones.
In the early 19th century, most stained glass in France was made of large panes that were extensively painted and fired. The designs were often copied directly from oil paintings by famous artists. In 1824, the Sèvres porcelain factory began producing stained glass to meet the increasing demand. During this period, many of Germany's ancient buildings were restored, and some, such as Cologne Cathedral, were completed in the medieval style. There was a great demand for stained glass, and the designs for many windows were based on the work of famous engravers such as Albrecht Dürer. Much 19th-century German glass has large sections of painted detail rather than outlines and lead-dependent designs.
In the mid-20th century, artists sought to transform ancient art forms into contemporary ones, using traditional techniques while also experimenting with different materials. One such innovation was the use of slab glass, a technique known as dalle de verre, where the glass is set in concrete or epoxy resin. This technique was introduced in the 20th century by Jean Gaudin and brought to the UK by Pierre Fourmaintraux.
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The assembly of stained glass
Cutting and Shaping the Glass:
Firstly, the glass is cut and shaped into the desired forms. This involves skilled artisans using specialised tools to cut the glass into specific shapes and sizes required for the design. This step sets the foundation for the entire piece.
Painting the Glass:
Once the glass pieces are ready, the painting process begins. Artisans use vitreous or glass paint, made from iron or copper oxide, ground glass, gum arabic, and a binder such as water, wine, or vinegar. The paint colours range from grey-black to brown and can be diluted to create various textures and consistencies. Fine details, such as shadows and outlines, are painted on with black paint, using brushes made from various animal hair.
Firing the Paint:
After painting, the glass pieces are fired to permanently adhere the paint to the glass. This process involves heating the glass at high temperatures in a kiln, causing the paint to fuse with the glass. This step requires precision in terms of temperature and timing to ensure the paint melts and bonds correctly.
Assembling the Window:
The painted and fired glass pieces are then assembled to create the stained-glass window. The pieces are laid out according to the design, with the edges fitted into H-shaped lead strips called "cames." These cames are soldered together to secure the structure. Putty is inserted between the glass and lead cames for waterproofing, ensuring the window can withstand the elements.
Installation:
Finally, the completed stained-glass window is installed in its designated location. This involves mounting the entire composition, stabilised by an iron frame (armature), into the window opening. This step requires careful handling and placement to ensure the fragile stained glass is securely installed.
The process of assembling stained glass combines artistic skill, technical knowledge, and a meticulous approach. It is a testament to the craftsmanship and creativity of ancient artisans, who perfected this art form over centuries, leaving behind a legacy of stunning stained-glass windows that continue to captivate and inspire.
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The history of stained glass painting
The basic ingredients for making glass are sand and wood ash (potash), which are melted into a liquid that, when cooled, becomes glass. To colour the glass, certain powdered metals are added to the mixture while it is still molten. For example, adding copper oxides to molten glass will produce green and blue tones. Once the glass has cooled, it can be pieced together to produce works of decorative art. These fragments can be held in place by various materials, including lead, stone, and copper foil.
Evidence of stained glass windows in churches and monasteries in Britain can be found as early as the 7th century. By the 12th and early 13th centuries, artisans composed their windows with a palette of deep, rich colours. When only clear glass could be used for doctrinal or economic reasons, it was decorated with a fine opaque mesh of grisaille, or monochromatically painted ornament, to soften the light.
In the early 19th century, most stained glass was made of large panes that were extensively painted and fired, with designs often copied directly from oil paintings by famous artists. During this time, there was a great demand for stained glass in Germany as many ancient buildings were being restored, and some, such as Cologne Cathedral, were completed in the medieval style. In the 20th century, new innovations in stained glass techniques emerged, such as slab glass set in concrete or epoxy resin, credited to Jean Gaudin, and Gemmail, a technique developed by Jean Crotti, which allowed for greater diversity and subtlety of colour.
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Frequently asked questions
The materials needed to make glass include sand, nitrate, and lots of heat. To fuse the ingredients together, a kiln must be heated to a temperature of 1100 degrees Fahrenheit. This was accomplished with large amounts of wood for burning and a strong breeze to provide enough oxygen for the fire. Early on, glassmakers knew how to colour glass with the addition of metallic oxides, and the colours and fabrics achieved depended on the qualities and quantities of added materials. Popular shades of blue were created by adding cobalt oxide and copper oxide.
In the early 19th century, most stained glass was made of large panes that were extensively painted and fired. The designs were often copied directly from oil paintings by famous artists. The paint used is an oxide of lead, usually in black, dark brown, or dark red.
Glassmakers would use a kiln to fire their glass. The kiln would be heated to a temperature of 1100 degrees Fahrenheit with large amounts of wood for burning and a strong breeze to provide enough oxygen for the fire.
