A photograph cannot diagnose condition
Use surface images to locate observations, not to identify material change, treatment or instability.
Locate visible evidence, identify technical claims by source and preserve every inaccessible or uncertain surface.
Name only visible features
Record line, loss, discoloration, deposit, gloss or roughness as appearance under stated conditions. Terms such as corrosion, mold, active flaking or adhesive residue imply technical identification and should come from qualified documentation. The image can guide a question, not settle it.
Control scale and focus
Every detail needs a whole view and a location frame. Quote dimensions from responsible records and avoid estimating feature size from screen pixels. Confirm focus on the object rather than glass; sharpening cannot recover a surface the camera failed to resolve.
Separate light from texture
Raking light enlarges shadows and can make shallow relief or dust appear severe. Frontal light may flatten the same feature. Compare permitted viewpoints and keep lighting notes. Do not combine exposures into an undocumented texture map.
Protect color uncertainty
White balance, case lighting, reflections and compression all alter color. Retain original capture and state adjustments. Use scientific or conservation sources for pigment and material claims. A screen image records an imaging chain, not direct colorimetry.
Do not infer activity
One photograph cannot show whether a crack is moving or a surface loss is ongoing. That requires monitoring, measurements and professional assessment. Avoid urgency language unless an institution has published it. If you have a genuine concern during a visit, follow staff guidance rather than conducting an improvised examination.
Compare dates with controls
A before-and-after comparison needs matched object identity, viewpoint, scale, light and processing. Differences in cameras or display can look like condition change. Preserve complete source records and describe uncontrolled variables before highlighting any apparent change.
Keep personal equipment away
Do not touch, illuminate with prohibited lights, place scales in cases or cross barriers. Visitor safety and museum rules define the observation method. Responsible distance may limit detail; state that limit and seek an official technical image instead.
Publish a surface note
A useful record includes object ID, feature location, capture date, camera position, glass and light conditions, edits and missing views. Label any interpretation from an external source. The note should remain useful without pretending to be a condition report.
Create a feature vocabulary
Use repeatable observable terms—linear depression, raised deposit, matte patch, glossy patch, missing area—without claiming cause. Define them in the project notes. Consistent vocabulary helps compare images while making clear that the categories are visual, not a professional material diagnosis.
Mark the imaging chain
Record camera or source, file date, lens where known, distance category, glazing, light direction, white balance and processing. These fields explain why the same surface can look different. A strong comparison makes the imaging chain visible rather than treating the photograph as transparent.
Set a publication limit
Determine the maximum useful display size before noise, interpolation or compression begins to resemble surface structure. Store that limit in the manifest and prevent CSS from enlarging the image beyond it. More pixels on screen do not create more observed evidence.
Respond responsibly to concern
Do not touch, test or publicly diagnose a feature. If something appears immediately concerning during a visit, follow museum instructions and speak discreetly to staff with the object location. The public article should not turn an uncertain photograph into alarm or direct treatment advice.
This editorial method is not diagnosis, monitoring, authentication or treatment advice. Raise immediate concerns with museum staff and use qualified professional records.