The safe default for fragile manuscripts is overhead, contactless camera capture on a book cradle, never a flatbed platen, with low cumulative light, conservator-approved opening angles and zero pressure on the media. Most damage during digitisation traces to four root causes: mechanical stress on the binding, excessive light exposure, contact with flaking media, and vibration. Diagnose which one you are facing and the fix is usually straightforward.

Why is a flatbed scanner the wrong tool here?

A flatbed forces the object flat against glass, stressing the spine of bound volumes and risking cracks in brittle parchment, wax seals or raised pigment. It also drags a lamp close to heat-sensitive media. For fragile material, switch to overhead capture: a copy stand or repro rig with the camera above and the object supported from below. The object never moves toward the sensor; the sensor's optics do the work.

Problem: the manuscript will not open flat. What now?

Forcing a tight binding to 180 degrees is a common, avoidable injury. The fix is a book cradle that supports both boards at a safe angle.

Symptom:  spine creaks; gutter text disappears into the fold
Root cause: binding forced beyond its safe opening angle
Fix:
  - Set the cradle to the conservator-approved angle (often 90-120 deg)
  - Capture one page at a time with a V-shaped cradle and angled camera
  - Use a glass platen ONLY if approved, and only acid-free, anti-reflective
  - For gutter shadow, add fill light on the gutter side, not more pressure

Never widen the angle to "get the text" — re-capture each page individually instead.

Problem: glare, hotspots or uneven light

Reflections off vellum, glazed pigment or glass platens ruin captures and tempt operators to crank up the lights, which harms the object.

• Cross-polarise: put polarising film on the lights and a polariser on the lens; rotate to kill specular glare without raising intensity.
• Diffuse the light source; bare lamps create hotspots.
• Angle lights at roughly 45 degrees and symmetrically to even out illumination.
• Use brief bursts of continuous light or short flash, and switch lights off between captures.

How do I keep light exposure within safe limits?

Light damage is cumulative lux-hours, so both intensity and total time matter. Practical controls:

• Use flash (very short duration) or low continuous light, never both at length.
• Block UV and IR with filters; LED panels with good colour rendering and no UV are ideal.
• Keep the object under light only while actually capturing.
• Track exposure time in your paradata so the cumulative dose is auditable.

Problem: flaking ink, lifting pigment or shedding particles

If you see media shedding, stop. Do not blow, brush, or touch the surface, and do not lay any strap or glass over actively flaking areas.

Symptom:  loose particles on the cradle; powdery pigment; lifting flakes
Action:
  1. Halt capture immediately.
  2. Photograph the condition as-is for the record.
  3. Remove handling aids that contact the media.
  4. Refer to a conservator before any further work.

A conservator may consolidate the media or set conditions (no straps, specific angle) under which capture can resume.

How do I hold pages down without pressure?

Use the lightest possible restraint:

Tool	Use	Caution
Weighted "snakes"	Hold margins, not text	Never over media or flaking areas
Polyester (Mylar) strap	Gentle hold across a board	Keep off raised/loose pigment
Acid-free foam wedges	Support boards in the cradle	Match to opening angle
Anti-reflective glass platen	Only if conservator-approved	Acid-free, never on brittle seals

The principle: support, never compress.

Problem: soft or shifting images from vibration

Long exposures plus a wobbly stand equal blur, and re-shoots mean extra handling. Mitigate by using a rigid copy stand, a remote/tethered shutter (no hand on the camera), mirror lock-up or electronic shutter, and a stable floor. Tethered capture into Capture One or digiCamControl also lets you check focus on a big screen without re-touching the object.

How should I document the handling decisions?

Record the condition assessment, the conservator's approved opening angle, the lighting and exposure settings, and any incidents. This paradata protects both the object and the institution, and tells future researchers exactly how the surrogate was made and under what constraints.

Key Takeaways

• Default to contactless overhead capture on a book cradle, never a flatbed platen.
• Set a conservator-approved opening angle; re-shoot pages rather than forcing the binding.
• Treat light as cumulative lux-hours — minimise intensity and time, block UV/IR.
• Kill glare with cross-polarisation and diffusion, not by raising light levels.
• If media is flaking, stop and refer to a conservator; never blow or touch the surface.
• Hold pages with the lightest restraint on margins only — support, never compress.
• Eliminate vibration with a rigid stand and remote shutter, and log every handling decision.

Frequently Asked Questions

Is it safe to use a flatbed scanner for fragile manuscripts?

Usually no. Pressing a fragile or tightly bound manuscript onto a flat platen stresses the spine and can crack brittle media. Overhead camera capture or a book cradle is the safe default for anything bound, brittle or with raised media.

How much light is too much for a fragile manuscript?

Keep cumulative light exposure low: use short flash durations or brief continuous bursts, avoid UV, and limit the object's total time under light. The damage is cumulative lux-hours, so minimise both intensity and duration.

What support should I use for a manuscript that will not open flat?

Use an adjustable book cradle that supports the boards at a safe opening angle (often 90–120 degrees for tight bindings), with foam wedges and a non-reflective polyester strap or weighted snake to hold pages without pressure.

How do I handle flaking ink or pigment during capture?

Do not touch or blow on the surface. Capture in a vibration-free setup, avoid any contact aids over the media, and if particles are actively shedding, stop and consult a conservator before continuing.

Should a conservator be involved before digitisation?

For anything visibly fragile, mould-affected, flaking or tightly bound, yes — a conservator should assess condition, set a safe opening angle and approve handling before capture begins. Documentation of that assessment becomes part of the record.

Related reading

• Digitise bound volumes: A Practical Guide
• Lighting for imaging cultural heritage
• When to Choose a scanner vs camera rig
• Digitise glass plate negatives
• Recover palimpsests with multispectral imaging