Added to this they use a lot of surface
pattern designs and techniques,
marking the surface of the clay with anything from pen lids, to children's toys, to leaves and flowers, pressed into the clay, which
burn off in the kiln.
Most of the time fire investigators find nonexistent
patterns, Lentini elaborated, or they think a certain
mark means the fire
burned «fast» or «slow,» allegedly indicated by the «alligatoring» of wood: small, flat blisters mean the fire
burned slow; large, shiny blisters mean it
burned fast.