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Do not store or display works of art in areas of potentially high humidity or water leakage, e.g. basement, bathroom, outside walls, under pipes. Avoid areas where temperature and humidity fluctuate, or where there is inadequate air circulation, e.g. attic and places listed above. Do not hang artworks over or under radiators, heating and cooling vents, ballet active fireplaces, humidifiers, and vaporizersA. The hygroscopic nature of wood means that it will take water from the atmosphere and expand, but it will contract as the humidity lessens. The direction of shrinkage is almost always around the circumference, which causes a solid piece clipart of wood to crack vertically. Keeping it in a steady relative humidity can stabilize the sculpture; if the wood does not absorb or release moisture, it will no longer expand or contract.

What is the cause of dark spots that sometimes appear on the paper of drawings and paintings? Reddish-brown spots are known as "foxing", caused by mold or the deterioration ballet of the metallic impurities left in the paper from the manufacturing process. Other colors of spots may be one of many types of mold damage. Mold spores clipart are everywhere in the environment, and mold thrives on cellulosic materials, especially in conditions of high humidity (above 65% of relative humidity). Keeping artworks out of high humidity areas like bathrooms or exterior walls, can help reduce the development of such stains. If I have a work of art on paper that appears to not be flat, should I be concerned? Paper is hygroscopic, reacting to changes in climate by expanding when it is humid and contracting when it is dry. A gentle undulation ballet in the paper called "cockling" occurs under these conditions, especially with larger works. This may impair the work aesthetically as well as cause mediums such as gouache to crack or flake as it is unable to expand and contract as the paper itself does.

Glazing can be either clipart glass or acrylic. Only glass should be used with any friable media such as unfixed pastels, charcoals, ballet or graphite, never acrylic clipart as it can damage the work by attracting these materials. There are many brands of acrylic glazing ballet to choose from; one with an ultraviolet filter is recommended. The frame and the mat should be deep enough to prevent the artwork from touching clipart the glazing. A stiff backboard behind the mat protects and supports the matted artwork. It is best to use non-acidic boards. A dust seal with paper or tape is also recommended. What damage results from using poor quality mat board? Avoid mat boards containing wood pulp which causes "matburn"--a darkening of the paper under the mat or at the bevel cut of the window mat. This type of stain permanently weakens the paper fibers and is not easily removed or lightened in conservation treatment.

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