 The Chinese in particular enjoyed the random effects of crackle and whereas in Ru ware it seems to have been a tolerated feature of most pieces, but not sought, in Guan ware a strong crackle was a desired effect.Crazing is also used as a term in odontology to describe fine cracks in the enamel of teeth.The root sense of “crazy” in English, meaning “to shatter, crush, or break,” dates to the 1300s.