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<p>[QUOTE="2manybooks, post: 1270804, member: 8267"]Such "craquelure" is common on old paintings, caused by a combination of factors. Traditional paintings on wood and canvas were built up with multiple layers of primer, ground, and pigmented paint, and the layers do not always react to changes in the environment in a uniform manner. As they age, the layers also become more brittle. Changes in relative humidity cause the supporting canvas or wood to expand and shrink, and the weakened paint layers cannot follow the changes, resulting in cracks. Direct physical stress also causes cracks. You might see a pattern of cracks radiating from the corners of a painting, caused by the canvas being keyed out to remove slack. Or a blow to the front or back of a painting can result in the circular spider web cracks as in your painting. The damage may not be immediately visible, but over time the stress shows up as cracks. I have seen one portrait that showed a disturbing distortion across the face that was caused by someone writing on the back of the canvas with a pencil.[/QUOTE]</p><p><br /></p>
[QUOTE="2manybooks, post: 1270804, member: 8267"]Such "craquelure" is common on old paintings, caused by a combination of factors. Traditional paintings on wood and canvas were built up with multiple layers of primer, ground, and pigmented paint, and the layers do not always react to changes in the environment in a uniform manner. As they age, the layers also become more brittle. Changes in relative humidity cause the supporting canvas or wood to expand and shrink, and the weakened paint layers cannot follow the changes, resulting in cracks. Direct physical stress also causes cracks. You might see a pattern of cracks radiating from the corners of a painting, caused by the canvas being keyed out to remove slack. Or a blow to the front or back of a painting can result in the circular spider web cracks as in your painting. The damage may not be immediately visible, but over time the stress shows up as cracks. I have seen one portrait that showed a disturbing distortion across the face that was caused by someone writing on the back of the canvas with a pencil.[/QUOTE]
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