Pitting

Localized loss or disruption of surface material that produces small depressions or cavities in glass or a coating.

Meaning and boundaries

Pits differ from removable particles, stains, and shallow surface films. A pit's cause cannot be determined from shape alone.

Why it matters in glass restoration

Pitting changes surface topography and may coexist with chemical attack, weld spatter, impact, embedded metal, or aggressive cleaning damage.

Related terms

• Weld spatter
• Acid attack
• Alkaline attack
• Surface flaw
• Haze

References

• National Glass Association — Construction Site Protection and Maintenance of Architectural Glass
  Publisher’s original source
• National Glass Association — Assessing the Durability of Decorative Glass
  Publisher’s original source
• Getty Conservation Institute — Twentieth-Century Building Materials: History and Conservation
  Publisher’s original source