Selection Of Eight Restored 19th C Neo-gothic Stained-glass Windows

The Color Experience: Stained-glass windows

“Color is a power which directly influences the soul” (Wassili Kandinsky, Moskou 1866 – Neuilly-sur-Seine, 1944)

“Color! What a deep and mysterious language, the language of dreams!” (« La couleur ! Quelle langue profonde et mystérieuse, le langage des rêves », Paul Gauguin, Paris, 1848-Fatu-Hiva, 1903)

‘Color and feeling’, ‘color and meaning’, these are concepts that have gone together since time immemorial. Artists and craftsmen have a special bond with color. After all, it is a means of expression that can have a real reinforcing effect. Especially linking color with light offers unlimited possibilities. Glaziers and glass painters have tried to master both these ‘instruments’ for centuries.
The set of beautifully restored neo-Gothic windows in our collection are enough reason for us to let these works of art figure in a broader story. As a bonus, we would like to introduce you to the contemporary stained-glass artist and stained-glass restorer, Daniël Theys. whose workshop is in Sint-Pieters-Rode (Belgium). He talked to us about the materials and techniques he used for the restoration of our set of neo-Gothic stained-glass windows. A fascinating look at the tricks of the trade from a specialist!

A bird’s eye view of the history of the European stained-glass window.

Although the Romans already used translucent glass plates to cover wall openings, the stained-glass window reached its peak in Europe between 1150 and 1500. A period also known as the era of the cathedrals. At that time, stained-glass windows became more than just a way to let in the light, and to keep the space closed off. From now on, their functionality was also found in their didactic value. The biblical and saints’ stories that adorned the stained-glass windows became a kind of poor man’s bible. They brought, as it were, the knowledge of the holy scriptures in an understandable, pictorial way. At the same time, the colored light provided additional symbolism. The invading light was interpreted as a manifestation of God. It is also no coincidence that the main altar was bathed in light. It was the place where the most important sacrament was celebrated, that of the Eucharist. How were these magical colors obtained? Well, during the 12th and 13th centuries, metal oxides gave color to the glass. Copper, for example, produced different colors in the various stages of oxidation. The metal could color the glass light blue, green and even red. It should be noted that from the 13th century onwards, clear glass, which was cheaper and at the same time allowed more light into the buildings, was used more often. A century later, in the years 1400 to 1500, glass painters frequently painted onto the glass with a ‘stain’ of silver chloride or sulfide. The painted piece of glass was heat-treated in a furnace. The heating process ensured that the silver ions migrated into the glass and became suspended within the glass network. The stain gave colors ranging from a pale yellow to a rather deep red. This new technique allowed glaziers to get more than one color on a single glass fragment. The shades produced by painting in silver chloride were well suited for depicting golden crowns, scepters and other gilded objects and ornaments. But the most important advantage of the technique was the fact that the glass painter could now make transitions from yellow tones to white without having to apply separations with lead strips! This also improved the legibility of the pictured scene.
You can imagine that the labor-intensive process of the production of stained-glass windows was a very costly affair and therefore it was often patrons who donated them to a church or a chapel. The benefactors were usually eager to propagate their social status and were moved by concern for their salvation.

In the 16th century, stained-glass windows also began to appear in secular buildings such as town halls, the homes of the wealthy and commercial premises such as inns. It is striking that during this period the use of lead strips that border many parts of the image was further reduced in favor of real painting on stained glass. This was due to an increasing love of detail. For example, one wanted realistically painted portrait heads. Working with enamel paints was cumbersome. Each newly applied color had to be burned into the glass before another color or overpainting could be applied. It was not only the coloring of the glass that was complicated, the process of obtaining flat glass plates required many steps as well. The glazier blew a glass bulb with a blowpipe and then cut it open. Finally, each half of the sphere was turned around so fast that it became a disc. In later periods, the glazier blew out his glass bulb into a cylinder. Once the cylinder had cooled, its closed ends were removed, and the long sides were cut open. The pieces of glass obtained were then heated and flattened. During the 16th century...