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Dichroic Glass
NASA developed dichroic glass for use in satellite mirrors. Multiple ultra-thin layers of different metals (gold, silver, titanium, chromium, aluminium, zirconium, magnesium, silicon) are applied to the surface of the glass in a vacuum chamber.
The resulting plate of dichroic glass can then be fused with other glass in multiple firings. Certain wavelengths of light will either pass through or be reflected, causing an array of color to be visible. Due to variations in the firing process, individual results can never be exactly reproduced; each piece of fused dichroic glass is unique and no two pieces are ever the same. - Wikipedia.org
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Art Glass
Most contemporary fusing methods involve stacking, or layering thin sheets of glass, often using different colors to create patterns or simple images. The stack is then placed inside the kiln and then heated through a series of ramps and soaks until the separate pieces begin to bond together. The longer the kiln is held at the maximum temperature the more thoroughly the stack will fuse, eventually softening and rounding the edges of the original shape.
Once the desired effect has been achieved at the maximum desired temperature, the kiln temperature will be brought down to avoid devitrification. It is then allowed to cool slowly over a specified time, soaking at specified temperature ranges which are essential to the annealing process. This prevents uneven cooling and breakage and produces a strong finished product. - Wikipedia.org
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