This is rocket science at work for you ! Spectacular iridescent colors are created in the laboratory by starting with optically high grade Quartz Crystals free of inclusions and water bubbles,heating to 3000 degrees in a vacuum chamber to activate the natural piezoelectric properties of the Quartz then injecting vaporized metal ions which bond electrically with the crystal. It is not a coating,the metal becomes part of the crystal structure. Irridescent snow white Niobium is the only color currently in stock.

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