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Bronze is an alloy life size arts of copper with other metals that modify its hardness, color, and ability to be cast into a detailed size mold. when bronze is cast it is usually a gold color. after arts the casting and finishing is completed, the surface is often treated life size arts with chemicals and heat which patinates size the metal, coloring it green, brown, black, or a combination of the colors. foundries usually apply waxes or other coatings to the surface of a patinated outdoor bronze to protect it from pollutants. this wax may wear off in time. we recommend annual maintenance by a professional conservator. the surface of the sculpture may be washed to remove pollutants and dirt, and waxed. if done annually, the rate of corrosion will be retarded (though not totally eliminated), and disfiguring rain streaks will be minimized. i collect twentieth-century furniture. how can i best arts preserve it? some twentieth-century life furniture was created from non-traditional materials, such as foam, plastic, and cardboard. what is the cause of dark spots that sometimes appear on the size paper of drawings and paintings? reddish-brown 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 arts in the environment, and mold thrives on cellulosic materials, especially in conditions of high humidity (above 65% of relative humidity). keeping artworks life out of high humidity areas like bathrooms or exterior walls, can help reduce the development of such size 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 arts contracting when it is dry. a life gentle undulation size in the paper called "cockling" occurs under these conditions, especially with larger works. this may impair the work aesthetically arts 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.
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