What is Dichroic?
Dichroic is defined as the property of having more than one color, expecially when viewed from different angles. Dichroic glass is a high-tech spin-lff of the space industry. Thn layers of metallic oxides, such as titanium, silicon and magnesium are deposited upon the surface of the glass in a high temperature, vacuum furnace.
The glass to be coated is carefully cleaned, and fastened to a planetary arm in the top of the furnace chamber. The oxides are placed in a crucible on the bottom of the chamber. Air inside of the chamber is removed with a high vacuum-producing cyropump, and the chamber is heated 5o 300 degree F. The metallic oxides are vaporized by an electron beam, and the rotating target is evenly coated with many thin layers. The resulting color is determined by the individual oxide compositions.
Dichroic coatings transmit certain wavelengths of light, while reflection others, thus creating an interference-effect similar to the iridescence observed in Nature's fire opal, dragonfly wings and hummingbird feathers. The transitted color is different than the reflected color, and a third color is produced by viewing the dichroic piece a a 45 degree angle. The resulting colors are pure, saturated, single wavelengths of light, that appear to originate from within the dichroic piece.

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