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<p>[QUOTE=&quot;Mill Cove Treasures, post: 265813, member: 60&quot;]What Brad said.&nbsp; Also, most older canvases and boards were treated with rabbit skin glue as a base.&nbsp; Rabbit skin glue is a protein and when exposed to humidity or moisture can become soft again. Over time this process of softening and hardening causes crackling.&nbsp; This is why most older paintings crackle. Today&#039;s canvases are treated with acrylic gesso that doesn&#039;t expand or contract but the fat over lean rule still applies.[/QUOTE]</p><p><br /></p>

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