End-grain patterns reveal growth seasons, while toolmarks betray period techniques. Saw kerfs, plane chatter, and mortise proportions can reject a century. We document edges, sample discreetly, and compare to reference collections, translating small scratches into credible arguments about origin, workshop habits, and later alterations.
Shellac fluorescence, wax composition, and protein glues speak a specific dialect of time. We analyze cross-sections, run FTIR or GC-MS when warranted, and correlate layers with known restorations. A single modern polyurethane layer may simply mean prudence, not deceit—context and sequence tell the full story.