pictures of tiger

What is the cause of dark spots that sometimes appear on the pictures paper of of drawings and paintings? Reddish-brown tiger spots are known as "foxing", caused by mold or the deterioration of the metallic impurities left in the paper from pictures the manufacturing process. Other colors of spots of may be one of many types of mold damage. Mold spores are everywhere in the environment, and tiger mold thrives on cellulosic materials, pictures 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 of 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 tiger it is humid and contracting when it is dry. A pictures gentle of undulation in the paper called "cockling" occurs tiger under these conditions, pictures and of especially tiger 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 glass or acrylic. pictures Only glass should be used with any friable media such as unfixed pastels, charcoals, or graphite, never acrylic as it of can damage the work by attracting these materials. There are many brands of acrylic glazing to choose tiger 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 from using poor quality mat board? Avoid mat boards containing wood pulp which causes "matburn"--a pictures darkening of the paper under the mat or of at the bevel cut of the window mat. tiger This type of stain permanently weakens the paper fibers and is not easily removed or lightened in conservation treatment.

©2003 www.animals-photos-arts.com. All rights reserved.