This crescent-shaped fracture typically occurs on bottles with a crown closure. Bottles broken during opening usually have a C-shaped fragment missing from the locking ring. This fracture pattern is usually caused when the consumer accidentally makes contact with the underside of the locking ring of the bottle with an opener rather than engaging just the cap.

This photomicrograph shows a top-down view of the sealing surface on a bottle. Three percussion cone flaws can be seen, of which one has extended into a crack across the finish. These percussion cones were caused by downward-directed impacts from a blunt object with a relatively small radius.

This blossoming flower is actually crystalline calcium carbonate (Ca2O3) that has grown on the inside surface of a bottle. This crystal was the result of atmospheric weathering present on the surface and is somewhat unusual in size as compared to others on this bottle and what is normally identified as small hexagonal crystallites. The picture was taken at 2500 X and colorized according to elemental composition.

Applied Ceramic Labels (ACL) are permanently bonded to glass containers by screen-printing a mixture of glassy material, pigment, and organic binder, then firing the container in a decorating lehr. The resultant label is highly wear and chemical resistant; however, defects such as this void can lower the surface strength of the glass container. Inclusions can also be caused by insufficient fusing temperatures, application issues, or raw material contamination. Because ACL is opaque and rather thin, light microscopy is of limited usefulness in finding these flaws. Consequently, SEM-EDX is the preferred imaging technique.