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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Choose multispectral imaging first for a flat, accessible document with faded, erased, overwritten, abraded, or chemically altered writing. It photographs the item under many wavelengths, typically ultraviolet through infrared, to increase the contrast between ink, paper or parchment, and damage. Choose X‑ray radiography or tomography when the writing is inside rolled, sealed, charred, or otherwise three-dimensional layers that cannot safely be opened. Phase-contrast X‑ray tomography can reconstruct those internal layers for virtual unrolling.
Neither technique guarantees a readable text. Success depends on the physical geometry, the difference between ink and substrate, the condition of the object, calibration, image processing, and specialist interpretation. Both approaches can be non-destructive when conservators set appropriate exposure and handling protocols, and they are often complementary rather than competing choices.
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What the two methods actually measure
Multispectral and hyperspectral imaging: changing the illumination
Multispectral imaging (MSI) records separate images under selected bands of light instead of treating the document as a single visible-light photograph. Systems commonly work from ultraviolet through infrared. In each band, ink, parchment or paper, mould, abrasion, stains, and later additions reflect or fluoresce differently. Software can then combine, subtract, or ratio the bands to make a faint mark stand out.
The National Archives defines MSI as a non-invasive technique that captures an object across different wavelengths from ultraviolet to infrared. That change in illumination can reveal faded text, underdrawings, erased annotations, and clues about the materials and damage. Hyperspectral systems collect a more continuous set of narrow bands and store the result as an image cube. The Library of Congress describes its hyperspectral preservation system as using 16 spectral bands; its project page was accessed in 2026.
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MSI is especially useful when the writing and the support are still on the same exposed surface but have acquired different spectral signatures. A peer-reviewed evaluation found that differing ink signatures can separate inks used in different areas or at different depths of a document, including palimpsests, and can distinguish ink from mould or abrasion. Recovery is not automatic: if the ink and substrate respond almost identically, or if damage overwhelms the signal, additional wavelengths or another modality may be necessary.
X-ray scanning: probing density, phase, and elements
X-ray methods do not depend on visible colour. Radiography measures how the beam is attenuated; tomography records projections while the object rotates and reconstructs a three-dimensional volume. Phase-contrast tomography detects tiny changes in how X-rays are refracted, which can reveal boundaries that ordinary absorption images miss. Element-sensitive approaches such as X-ray fluorescence (XRF) map chemical elements rather than only density.
This makes X-ray scanning the escalation for writing hidden inside an object: a tightly wound roll, a sealed container, charred layers, or a page stack that cannot be separated. In the Herculaneum papyri, phase-contrast X-ray tomography (XPCT) exposed letters inside unopened, rolled scrolls. The Nature Communications report from 2015 states a spatial resolution of 100 micrometres in each of the three dimensions. Computational segmentation and virtual unrolling then turn the volume into flattened layers for reading.
Conventional absorption contrast can fail when carbon-based ink and parchment have similar composition. Phase contrast, high-resolution micro-CT, or elemental mapping such as XRF may supply the missing contrast. The Hill Museum & Manuscript Library (HMML) notes that text well below the parchment surface, or text obscured by other elements, may require XRF imaging.
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Side-by-side decision guide
| Decision axis | Multispectral or hyperspectral imaging | X-ray scanning (radiography, micro-CT, phase contrast, XRF) |
|---|---|---|
| Information geometry | Primarily surface and near-surface contrast on a flat, accessible page | Internal layers, rolled or sealed objects, and three-dimensional structure |
| Contrast mechanism | Different reflection or fluorescence at selected wavelengths | Density, phase shift, elemental composition, or reconstructed geometry |
| Typical wins | Faded, erased, overwritten, abraded, foxed, or chemically altered text; many palimpsests | Charred or tightly rolled scrolls; writing hidden inside layers; objects unsafe to open |
| Capture burden | Calibrated camera, controlled illumination, spectral registration, and processing | Specialist source and detector, dose control, tomography, segmentation, and virtual unrolling |
| Access profile | Portable and laboratory systems exist; a lower-cost portable system is being developed by RIT’s MISHA initiative | Usually requires a specialist laboratory, synchrotron, or high-end micro-CT facility |
| Main failure mode | Too little spectral difference between ink and support, or damage that overwhelms the signal | Too little X-ray, density, phase, or elemental difference; reconstruction and segmentation errors |
| Conservation concern | No physical contact or opening, but illumination and exposure still need conservation limits | Non-destructive demonstrations exist, but dose and possible material effects require an explicit assessment |
Which method fits the document?
Flat pages, fragments, and exposed writing
Start with MSI or hyperspectral imaging when a page can be viewed without forcing it flat and the problem is legibility rather than access. This includes ink that has faded, been washed, been scraped, been overwritten, or chemically changed; writing hidden under a later text in a palimpsest; and marks obscured by foxing, mould, or abrasion. The camera can work above the item without contact, and multiple bands can be captured without repeatedly handling the page.
MSI is not limited to medieval manuscripts. Documented applications include the Archimedes Palimpsest, the Syriac Galen Palimpsest, Livingstone’s diaries, Dead Sea Scrolls, and letters in the Hudson Bay Archives. In each case, the useful signal came from a particular relationship between ink, substrate, and damage; a successful result on one collection does not establish the same wavelength recipe for another.
Palimpsests and multiple inks
A palimpsest may contain a scraped or washed-away undertext plus a later text. Different inks can have different spectral curves, so one band combination may suppress the upper writing while another emphasizes the undertext. MSI can also help distinguish writing made in different areas or at different depths when the layers remain optically accessible.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Do not assume MSI is always sufficient. HMML’s palimpsest work identifies XRF as an escalation when the desired text lies well below the surface or is masked by other elements. In that situation, an elemental map may separate an ink component that has little visible or reflected-light contrast.
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Rolled, sealed, or charred objects
Do not open or unroll an object merely to test whether the text can be read. A charred Herculaneum papyrus is the defining X-ray case: it is too fragile to unfold, yet XPCT can image internal layers and permit computational virtual unrolling. The U.S. National Endowment for the Humanities describes computerized techniques that digitally unroll X-rayed layers to discern carbon-based ink. The European Synchrotron Radiation Facility likewise reports reading writing in charred scrolls without opening them, avoiding the physical damage caused by unrolling.
For a sealed container or a thick stack, ordinary radiography may first show the gross structure. If layers overlap or ink has nearly the same attenuation as the support, a specialist may recommend phase contrast, micro-CT, or XRF instead. The choice depends on composition, thickness, required resolution, and whether the volume can be segmented reliably.
A conservation-first workflow
1. Record condition and restrictions
- Photograph and describe the object in its current state, including tears, flaking, friable soot, folds, surface deposits, and existing supports.
- Record whether opening, flattening, turning pages, or exposure to particular light levels is prohibited. A fragile item should not be manipulated solely to improve a test image.
- Define the scholarly question: locate an undertext, read a particular line, map an erased annotation, identify an ink, or reconstruct an entire internal layer. The question determines the required resolution and modality.
2. Screen an accessible item with MSI
- Mount the document without contact with the imaging surface. Use a rigid support or cradle appropriate to its condition.
- Calibrate the camera, illumination, and colour or reflectance reference before the document session. Record the wavelength or band, exposure, focus, geometry, and environmental conditions for every capture.
- Capture the complete set of selected ultraviolet, visible, and infrared bands rather than relying on a single dramatic-looking exposure. Fluorescence images, when appropriate, must be captured with the excitation and emission conditions recorded separately.
- Register the bands so the same pixel corresponds to the same physical point. Misregistration can create false edges that look like writing.
- Generate several documented products—band ratios, principal-component views, or false-colour composites—while preserving the untouched captures. A processed image is an interpretation, not a replacement for the raw data.
3. Escalate internal or chemically hidden writing to X-ray specialists
- Consult a facility experienced with cultural-heritage objects before transport. Supply the condition report, dimensions, estimated composition, support details, and the conservation limits.
- Select the modality with the facility: radiography for a quick structural survey; micro-CT for three-dimensional density; phase contrast when interfaces are subtle; or XRF when elemental composition is the strongest discriminator.
- Set the beam energy, dose, detector, magnification, and scan time to the minimum that can answer the question. A non-destructive demonstration does not remove the need for a document-specific dose assessment.
- Reconstruct the volume and segment layers conservatively. Virtual unrolling may require flattening curved sheets, correcting folds, and separating ink from fibres or soot; each operation can introduce artefacts.
- Export the volume, reconstruction settings, segmentation masks, and flattened views together. Another scholar should be able to inspect the path from measurement to proposed reading.
4. Validate the reading
- Compare the proposed characters with the physical object and with independent bands, projections, or scans.
- Have a conservator and a manuscript specialist review the result jointly. A high-contrast line can be a scratch, fibre, crack, or reconstruction edge rather than ink.
- Mark uncertain characters and alternative readings instead of silently converting ambiguous pixels into definitive text.
How image processing changes the answer
Processing is part of both methods, not a cosmetic final step. MSI requires spectral registration, flat-field or reflectance calibration, and a documented choice of combinations or subtractions. A band that suppresses the substrate may also suppress part of the ink; aggressive enhancement can create halos and false strokes. Keep the original bit depth and avoid repeatedly saving compressed images.
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X-ray work adds reconstruction and segmentation. Ring artefacts, beam hardening, motion, incomplete projections, and overlapping sheets can obscure a character. Virtual unrolling may straighten a layer incorrectly or place adjacent fragments on top of one another. The 100-micrometre figure reported for the 2015 Herculaneum XPCT study is a measured spatial resolution for that experiment, not a universal guarantee for every scanner or object.
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For either method, preserve a provenance package containing raw captures or projections, calibration files, instrument settings, processing software and version, parameter values, operator notes, and the identity of every derived image. This allows a later analyst to reproduce a result or test a different enhancement without losing the evidence trail.
When each method fails—and what to try next
MSI produces no useful contrast
- Likely cause: ink and support have similar spectral responses, or the damage has a stronger signal than the writing.
- Check: calibration, focus, band registration, illumination uniformity, and whether the suspected ink is reflective or fluorescent in the selected bands.
- Next step: test additional bands or fluorescence, use a different processing model, and consult a specialist about XRF or another elemental method if the text is subsurface.
MSI shows convincing marks that cannot be verified
- Likely cause: scratches, fibres, mould edges, compression artefacts, or enhancement halos mimic characters.
- Check: the raw band images and the same location in independent captures. A feature present only after one aggressive subtraction is weak evidence.
- Next step: have conservators and palaeographers inspect the physical feature and publish uncertainty with the transcription.
X-ray scans show structure but not letters
- Likely cause: absorption contrast between ink and support is too low, or the voxel size and signal-to-noise ratio are insufficient.
- Check: material composition, beam energy, phase information, detector geometry, and whether the ink contains a detectable element.
- Next step: consider phase-contrast tomography, higher-resolution micro-CT, or XRF mapping rather than simply increasing dose.
Virtual unrolling is unstable
- Likely cause: sheets touch, tear, fold unpredictably, or have irregular density; segmentation then joins or splits layers incorrectly.
- Check: the three-dimensional volume before trusting a flattened view. Follow a proposed line through adjacent slices.
- Next step: refine the segmentation, use multiple flattening paths, and report portions that remain unreadable instead of forcing a continuous text.
Safety and non-destructive claims
“Non-invasive” means the object is not cut, opened, or touched by the imaging probe; it does not mean every exposure is risk-free. The National Archives and Library of Congress describe MSI and hyperspectral imaging as non-invasive and non-destructive techniques when operated appropriately. Light intensity, ultraviolet exposure, heat, and total session time still require conservation controls, especially for fugitive dyes and photosensitive media.
X-ray studies of fragile papyri demonstrate that useful information can be obtained without unrolling or physically impairing the scroll. X-rays are nevertheless ionizing radiation, and dose, energy, scan duration, and repeated examinations must be reviewed for the particular material. A conservator should approve the protocol, and the facility should document the estimated dose and any material-effects assessment.
Access, equipment, and practical trade-offs
MSI has a broader access profile. Portable and laboratory systems exist, and the Rochester Institute of Technology’s MISHA initiative received a 2020 National Endowment for the Humanities grant to develop a lower-cost portable system and software for damaged, erased, or overwritten cultural-heritage objects. “Portable” does not mean point-and-shoot: reliable work still needs calibrated illumination, stable geometry, spectral registration, and trained processing.
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High-quality X-ray tomography usually requires a specialist laboratory, synchrotron beamline, or high-end micro-CT system. Transport, scheduling, mounting, dose planning, reconstruction, and computational expertise can dominate the project. A synchrotron is not automatically the best choice; the right detector and contrast mechanism for the object matter more than the facility’s prestige.
Neither method has a universal price or turnaround time. Facility availability, geography, object size, conservation restrictions, resolution, and the amount of processing determine the real effort. Obtain a written scope that states the modality, expected resolution, dose or light limits, data formats, processing deliverables, and who will interpret the text.
A combined strategy often gives the strongest result
MSI and X-ray imaging answer different geometric questions. A sensible project can use MSI to map exposed writing, identify likely ink or damage, and guide the interpretation of a later X-ray volume. X-ray tomography can reveal internal layers while MSI supplies surface context for registration and validation. If both methods show the same character independently, confidence increases; if they disagree, the disagreement identifies a calibration, layer-assignment, or interpretation problem to resolve.
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For a flat palimpsest, begin with a conservation-approved MSI survey, then escalate only the regions that remain ambiguous. For a charred roll, avoid opening it and plan tomography first; MSI may still document the exterior. For subsurface writing in a thick support, ask whether elemental contrast through XRF is more appropriate than another reflected-light pass. The decision should follow geometry and contrast, not a preference for a fashionable instrument.
Decision checklist
- Is the writing exposed on a page or fragment? Start with MSI or hyperspectral imaging.
- Is the item rolled, sealed, charred, or unsafe to open? Consult an X-ray tomography specialist.
- Is the suspected text deep below the surface or masked by another material? Ask about XRF or another elemental-contrast method.
- Could ink and substrate have nearly identical responses? Plan a modality comparison instead of assuming MSI or absorption CT will work.
- Are conservation limits documented? Set light, dose, handling, and transport controls before capture.
- Can another researcher audit the result? Preserve raw data, calibration, parameters, reconstructions, and uncertainty notes.
The practical rule is simple: use wavelengths to separate an exposed surface; use X-rays to see through an inaccessible volume. Treat contrast, geometry, conservation risk, and processing provenance as equal parts of the decision, and bring in a second modality when the first cannot establish a reliable reading.
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