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Dichroic Glass Pendant
The process of making this glass is called thin film physics, and I will try to condense it.
It is an intriguing process that was invented and used by NASA in the 50's and 60's. Multiple ultra-thin layers of different metals gold, silver, metal oxides, titanium, chromium, aluminum, zirconium, magnesium and silica are vaporized by an electron beam in a vacuum chamber.
This can be as many as 30-50 layers, and only 30 to 35 millionths of an inch thick. Artist started to use the process because the characteristic of dichroic glass, is that it has a transmitted color and a completely different reflected color, as certain wavelengths of light either pass through or are reflected. This causes an array of color to be displayed.