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 science clipart, 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, japanese clipart, jewish clipart, kids clipart, knight clipart, leprechaun clipart, library clipart, lighthouse clipart, lobster clipart, logo clipart, love clipart, mailbox clipart, map clipart, marijuana clipart, martial arts clipart, masonic clipart, math clipart, medical clipart, medieval clipart, rose clipart, rugby clipart, safety clipart, santa clipart, scientific clipart, sewing clipart, sex clipartglazing can be either glass or acrylic. only glass should be used with any friable media such as unfixed pastels, charcoals, or graphite, never acrylic as it can damage the work by attracting these materials. there are many brands of acrylic glazing 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 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 clipart from using poor quality mat board? avoid mat boards containing wood pulp which causes "matburn"--a islamic 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. glazing can be either glass or acrylic. only glass should be used with any friable media such as unfixed pastels, charcoals, or graphite, never acrylic as it can damage the work by attracting these materials. there are many brands of acrylic glazing 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 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 clipart from using poor quality mat board? avoid mat boards containing wood pulp which causes "matburn"--a islamic 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. what clipart 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 conditions, especially with larger works. this may impair the work aesthetically as well as cause mediums such as gouache to crack or flake as islamic it is unable to expand and contract as the paper itself does. online clip art
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