Problems with Art on Paper
Tears are usually the result of abuse, poor handling, and neglect, most often as paper ages and becomes more brittle.
Tapes commonly used to secure and repair art on paper can permanently stain and damage the art.
Acid burn is a common term for the darkening of paper caused by the interaction of light, temperature & humidity with the paper's ingredients or the ingredients of materials in direct contact.
To see more examples of these conditions CLICK on IMAGE
Mold on paper is often recognized as spots and referred to as foxing; it is actually the attack of a microorganism, staining and consuming the cellulose.
Water stains, also called tide lines, are the result of exposure to water or high humidity that washes or concentrates impurities into visible stains.