Copperheads are reddish brown spots, which may vary in size from almost invisible to 3.2 mm.
Lumps
Lumps are common enamel defects, which are characterised by rounded raised areas with typically a diameter between 3 to 12 mm.
Scaling
Scaling is a common enameling defect, which is caused by contamination with materials with a higher melting temperature than enamel.
Blisters
Blisters are a common enamel defect, which is characterized by appearance of circular holes & bubbles in a cooled enameled surface.
Fishscaling of porcelain/vitreous enamel coatings
Fishscaling is an enameling defect, which is characterized by small enamel particles chipping off.