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Glass containing two or more phases with different refractive indices shows coloring based on the Tyndall effect and explained by the Mie theory, if the dimensions of the phases are similar or larger than the wavelength of visible light. The scattered light is blue and violet as seen in the image, while the transmitted light is yellow and red.
The primary method of including colour in stained glass is to use glass, originally colourless, that has been given colouring by mixing with metal oxides in its melted state (in a crucible or "pot"), producing glass sheets that are coloured all the way through; these are known as "pot metal" glass. [2]
Medieval stained glass is the colored and painted glass of medieval Europe from the 10th century to the 16th century. For much of this period stained glass windows were the major pictorial art form, particularly in northern France, Germany and England, where windows tended to be larger than in southern Europe (in Italy, for example, frescos were more common).
One of the most prestigious stained glass commissions of the 19th century, the re-glazing of the 13th-century east window of Lincoln Cathedral, Ward and Nixon, 1855. A revival of the art and craft of stained-glass window manufacture took place in early 19th-century Britain, beginning with an armorial window created by Thomas Willement in 1811–12. [1]
Favrile was the first art glass to be used in stained-glass windows. Tiffany planned to make patterns in windows based on the shapes and color of his glass. [ 5 ] Favrile glass also backs a large ornamental clock in Detroit's Guardian Building . [ 11 ]
Opalescent glass. The term "opalescent glass" is commonly used to describe glass where more than one color is present, being fused during the manufacture, as against flashed glass in which two colors may be laminated, or silver stained glass where a solution of silver nitrate is superficially applied, turning red glass to orange and blue glass to green.
The clearest and finest glass is tinted in two ways: firstly, a natural coloring agent is ground and melted with the glass. Many of these coloring agents still exist today; for a list of coloring agents, see below. Black glass was called obsidianus after obsidian stone. A second method is apparently to produce a black glass which, when held to ...
In traditional stained glass, silver stain is a technique to produce yellow to orange or brown shades (or green on a blue glass base), by adding a mixture containing silver compounds (notably silver nitrate), and firing lightly. It was introduced soon after 1800, and is the "stain" in the term "stained glass".