A limited examination or procedure used to distinguish among plausible materials, causes, or condition types.
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Meaning and boundaries
A diagnostic response is evidence, not automatic proof; tests can be ambiguous, destructive, surface-specific, or outside their validated scope.
Why it matters in glass restoration
Appropriate tests can separate deposits from altered glass, coatings from residue, transferred metal from grooves, and accessible from inaccessible surfaces.
Related terms
References
- ASTM International — ASTM C1376-21a: Pyrolytic and Vacuum Deposition Coatings on Flat Glass
Publisher’s original source - Getty Conservation Institute — Twentieth-Century Building Materials: History and Conservation
Publisher’s original source - National Institute of Standards and Technology — Fractography of Ceramics and Glasses, 3rd edition
Publisher’s original source - Vitro Architectural Glass — Glass Cleaning Recommendations
Publisher’s original source