The process of developing fine cracks in ceramic glazes, paint, or other surfaces; or the act of becoming crazed or frantic.
From 'craze' (verb, to crack or become frantic) plus the gerund suffix '-ing.' In pottery, crazing is a technical term for a specific type of surface damage that occurs during firing or aging.
Potters actually have to carefully control crazing—too much and the piece fails, but some artists intentionally create crazing patterns for aesthetic effect, turning a defect into a desired feature through artistic vision.
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