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Systematic observation of glass and its surrounding system under stated viewing conditions to detect and describe visible features.

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Meaning and boundaries
Visual inspection cannot by itself determine hidden crack depth, residual stress, load capacity, coating identity, or every cause of damage.
Why it matters in glass restoration
A consistent method reduces disagreements caused by changing light, distance, angle, cleanliness, or observer expectations.
Related terms
References
- U.S. General Services Administration — Cleaning Historic Masonry
Publisher’s original source - ASTM International — ASTM C1036-25: Standard Specification for Flat Glass
Publisher’s original source - National Glass Association — Guidelines on How to View Decorative Glazing Products
Publisher’s original source - National Glass Association — GANA Glazing Manual, 2022 edition
Publisher’s original source