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Stained-glass example of chromostereopsis. It is commonly found in stained-glass, historically artists have been aware of this effect, using it to generate advancing or receding perspectives within the images. [11] Red–blue contrast was used in a portrait of Goethe
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.
Cobalt glass—known as "smalt" when ground as a pigment—is a deep blue coloured glass prepared by including a cobalt compound, typically cobalt oxide or cobalt carbonate, in a glass melt. Cobalt is a very intense colouring agent and very little is required to show a noticeable amount of colour.
The stained glass of Islam is generally non-pictorial and of purely geometric design, but may contain both floral motifs and text. Stained glass creation had flourished in Persia (now Iran) during the Safavid dynasty (1501–1736 A.D.), and Zand dynasty (1751–1794 A.D.). [27]
Chartres' windows are celebrated for their cobalt blue, known as "Chartres blue" or "Romanesque blue", which first emerged in the workshops at Saint-Denis Basilica in the 1140s and was also used at Le Mans Cathedral. With a sodium base coloured with cobalt, it is the more resistant than reds and greens of the same era. [16] [17]
Glass can be coloured by adding metal salts or painted and printed with vitreous enamels, leading to its use in stained glass windows and other glass art objects. The refractive , reflective and transmission properties of glass make glass suitable for manufacturing optical lenses , prisms , and optoelectronics materials.
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Kiln-formed glass sculpture "United Earth" by Tomasz Urbanowicz. Several of the most common techniques for producing glass art include: blowing, kiln-casting, fusing, slumping, pâté-de-verre, flame-working, hot-sculpting and cold-working. Cold work includes traditional stained glass work as well as other methods of shaping glass at room ...