A sample is easier to review when an untouched reference remains visible beside the worked area. Where current material guidance allows it, plan a small observation window that preserves the original surface and stays clearly separated from the test artwork.
Label what the window represents
Photograph the full blank before work, then photograph the sample and reference area together under consistent light. Record the supplier description, batch or purchase reference when available, artwork revision, date, and viewing conditions. Do not treat appearance as proof of material composition.
Report only the visible comparison
The window can help a reviewer describe visible contrast or surface variation on that recorded piece. It cannot establish permanence, coating behavior, safety, compatibility, or repeatability across batches. If masking or cleaning could introduce an unknown substance, stop and check current guidance first.
Only work with identified materials supported by current documentation. Confirm focus, secure positioning, shielding, ventilation, and attended operation. The reference window improves context; it does not make an uncertain material suitable.
Find more material documentation practices in /updates/.
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