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 cool clipart, country clipart, cow clipart, cowboy clipart, devil clipart, hockey clipart, holiday clipart, horse clipart, hospital clipart, house clipart, indian clipart, insect clipart, internet clipart, irish clipart, islamic clipart, japanese clipart, jewish clipart, kids clipart, knight clipart, leprechaun clipart, library clipart, lighthouse clipart, lobster clipart, logo clipartwhat 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 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 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 in the paper called "cockling" occurs under these map conditions, especially with larger works. this clipart may map 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. 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 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 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 in the paper called "cockling" occurs under these map conditions, especially with larger works. this clipart may map 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. online clip art
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