Lacquer cracks are generally caused by drastic changes in temperature or humidity. The lacquer is attached to the outside of the wood. While the wood can expand and contract with differing amounts of humidity in the air, the lacquer, for all practical purposes, cannot.
This is the major reason behind lacquer cracks–the wood moves while the lacquer remains still. Most lacquer cracks start out small and internal, often called crazing or checking. These cracks look like hairline cracks, but cannot be felt when you run your finger across the top of the finish.
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