Dichroic glass was first developed for scientific applications such as lasers and space mirrors. The dichroic effect is achieved when vaporized metal oxides are deposited in microscopically thin layers using a specialized vacuum chamber. The type of metal oxides and the number of layers determines the final color. The colors are produced from light being bent in a prism effect, exactly like what occurs in rainbows. Unlike dyes or pigments, which absorb 50% of light, about 95% of the light is reflected back. Many layers of thin glass are fired in a kiln 4 or 5 times to achieve the right effect. Each firing is a precise temperature between 1300 and 1450 degrees. The process can take up to 15 hours because the glass must heat and cool very slowly.