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Conservation-restoration is the practice of cleaning and discovering the original state of an object, investigating the proper treatments and applying those treatments to restore the object to its original state without permanently altering the object, and then preserving the object to prevent further deterioration for generations to come (Caple, p. 5-6). [1]
Glass disease, also referred to as sick glass or glass illness, is a degradation process of glass that can result in weeping, crizzling, spalling, cracking and fragmentation. [ 1 ] [ 2 ] Glass disease is caused by an inherent instability in the chemical composition of the original glass formula. [ 3 ]
This is often the case with the fading or disappearance of fine detail, such as faces, in figural stained glass art (fig. 2). Over time, enamels can begin to flake off of glass panels, and certain types or colours of stains can discolour with continued UV exposure, all of which significantly alters the aesthetic impact of the work as a whole ...
The most valuable glass you could find, however, is art glass—pieces not intended to be used practically as vases and such but rather meant to be art alone. Here are a couple of the most notable ...
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.
Bottles in different colors Mixed color glass cullet Public glass waste collection point for different colors of containers. Glass recycling is the processing of waste glass into usable products. [1] Glass that is crushed or imploded and ready to be remelted is called cullet. [2] There are two types of cullet: internal and external.
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Annealing is a process of slowly cooling hot glass objects after they have been formed, to relieve residual internal stresses introduced during manufacture. Especially for smaller, simpler objects, annealing may be incidental to the process of manufacture, but in larger or more complex products it commonly demands a special process of annealing in a temperature-controlled kiln known as a lehr. [1]