![]() Both glass and acrylic glazings are available with built-in anti-static properties. This filter slows the photocatalytic degradation of organic materials in the picture. Except for pictures of only temporary interest, a glazing should incorporate a filter to block almost all ultraviolet radiation (a UV filter) from penetrating the glazing. Now, both picture framing glass and acrylic sheet are available with anti-reflective coatings to make the glazing virtually invisible under most lighting conditions. It is wise to consult an experienced art framer or conservator for help in making the better choice. Choosing which to use requires taking into account a variety of each object's characteristics: size, media used, condition of media, perceived value of object, anticipated use of the object, e.g. Since the 1980s significant advances have been made in the manufacture of picture glazings, creating a much broader range of options in both glass and acrylic products. If the art in the frame is considered dispensable or if the exhibition environment is highly controlled, no glazing may be used. The picture frame may contain a protective "glazing" of picture framing glass or acrylic sheet, e.g. It restrains materials in the frame and can be used to help set off or reveal the picture aesthetically. The lip extends a proportionate distance up from the edge of the rabbet. The rabbet functions as a shelf to hold the frame glazing (if any is to be used), some sort of spacer or mat/matte to keep the object safely behind the inner surface of the glazing, the object itself, and backing boards to protect the object from physical damage and environmental pollutants. Picture frame mouldings come in a wide variety of profiles, generally in some sort of L shape with an upward "lip" and a horizontal rabbet. Intricate decorations are often made of molded, then gilded plaster over a wood base. Some picture frames have elaborate molding, which may refer to the subject matter. Both genuine gilding and imitation gold remain popular, although innumerable other surfaces are to be found in most framing establishments. A frame surface may be of any color or texture. silver, bronze, aluminum, and stiff plastics such as polystyrene. Traditionally picture frames have been made of wood, and it remains very popular because wood frames can provide strength, be shaped in a broad range of profiles, and allow innumerable surface treatments. When framed properly, an artifact is far more likely to remain in good condition for a long period of time. The purpose of a picture frame is to protect the art and present it to its best advantage. It makes displaying the work safer and easier and both sets the picture apart from its surroundings and aesthetically integrates it with them. A picture frame is a simultaneously protective and decorative edging for a picture, such as a painting or photograph.
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