The total light transferred through the glazing material (light transmission) is reduced by reflection and/or absorption. Light transmission (for this article, the perceivable visible spectrum between 390 nm and 750 nm is considered) through glass is diminished either by light reflection or light absorption of the glazing material. Light transmission of glass is especially important in art framing, since light passes through the glass twice – once to illuminate the artwork, and then again, reflected from the artwork, as colors - before reaching the viewer. Visible light transmission is the primary measure of glass' invisibility, since the viewer actually sees the light, reflected from the artwork. Therefore, the least visible glazing best displays the artwork behind it. In the case if the framed object or artwork is UV resistant, UV protection can still serve the purpose of preserving the integrity and colors of non-conservation grade framing materials susceptible to UV damage, such as mat board (passe partout).Īlthough protection is a primary purpose of glazing, displaying an artwork is the primary purpose of framing it. Artworks that require protective glazing are those rendered on paper or fabrics (including photographs), which contain pigments and dyes that absorb UV and are susceptible to discoloration. Regular glass as well as some glass surface treatments can also filter some of the damaging ultra-violet radiation (UV) and heat (NIR). Laminated glass and some acrylic may be used to protect against physical damage from glass breakage and to offer protection from a malicious attack. The primary purpose of glazing in art framing is to clearly exhibit the work while physically protecting it from damaging factors such as light ,humidity, heat, and soiling. 4.2 How much UV filtering should a glazing have.3.2.3 Features of Anti-Reflective Coatings.3.1 Matte (Etched, "Non-Glare," or "Anti-Glare").3 Glass Surface Treatments and Coatings.2.2 Low-iron (or "Extra-Clear," "Water White," etc).
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