increases the amount of damaging radiation on an artwork. One of the most thorough and independent studies was conducted by the US Library of Congress in an effort to display and preserve the US Declaration of Independence. At first, it was decided to use special yellow "Plexiglass UF3", which removes both the ultra-violet as well as the blue end of the visible spectrum, with significant, but acceptable interference for viewing. Sealing the display by a chemically inert gas such as nitrogen, argon or helium also aided its preservation. In 2001, the display of the US Declaration of Independence was revised to include a multi-laminated glazing for shatter-resistance, with sol-gel interference-based multi-layer Anti-Reflective coatings on outer surfaces to improve the visibility of the document. From the above evidence, it can be concluded that if preservation were the only goal of glazing, then only a climate-controlled, dark space would offer the best possible protection for an artwork, which can be exhibited once in every several years, while no glass at all provides a perfect displaying option. Therefore, for those artworks, which are chosen to be displayed, the ideal amount of UV blocking should be as much as possible, without affecting the visible light transmission. Controlling UV Lighting Inside While determining how much UV light should be filtered by art glazing, it may also be important to consider the amount of UV light present inside a room or a building. Note that regular window glazing filters away a significant portion of the UV light, which originates from the sun. The relative amounts of damaging light in equal quantities of light: The above indicates that the damage level of even direct sunlight coming from the horizontal skylight is reduced to 36% by regular window glass. Due to the sun's changing position, even less direct light enters through side windows and hanging an artwork away from direct sunlight reduces the exposure to potentially damaging direct sunlight even further. Indoor lighting, especially fluorescent lighting, is considered to contain some UV Light. GELighting.com asserts that "UV exposure from sitting indoors under fluorescent lights at typical office light levels for an eight-hour workday is equivalent to just over one minute of exposure to the sun in Washington D.C. on a clear day in July. Additionally, the relative damage of incandescent light is 3 times less than that of fluorescent light. Since UV filtering picture framing glass does not