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What is the cause of dark mickey spots that sometimes appear waterford mantle cherub on the paper of drawings and paintings? reddish-brown picture frames spots are known as "foxing", caused by mold or the deterioration 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 are everywhere in the environment, and mold thrives on mickey cellulosic materials, especially in conditions of high humidity mantle (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. ultrasound picture 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 mickey and mantle by expanding when it is humid picture and contracting mickey when mantle it is dry. a gentle undulation in the paper called "cockling" occurs under these conditions, especially picture 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. do not store or display works of art in areas of potentially high humidity or water leakage, e.g. basement, mickey 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, active fireplaces, humidifiers, mantle 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 of wood to crack vertically. keeping picture 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.
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