Free tools Windows power users keep installed
One-click scans. No signup required.
iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
X-ray fluorescence (XRF) elemental maps gave conservation scientists a view of a degraded Roman wall painting that ordinary light could not provide. In the approximately 2,000-year-old portrait of a woman from Herculaneum, the maps distinguished separate colour layers and revealed an underlying sketch. The finding shows what chemical imaging can recover from a damaged surface, but the published account does not identify the exact pigments, describe a restoration, or claim that the portrait’s original appearance has been fully reconstructed.
What the elemental maps revealed
A report published by Chemistry World on August 21, 2017, described conservation scientists examining a degraded wall painting of a woman from Herculaneum. The painting was described as about 2,000 years old. Instead of relying only on the colours still visible to the eye, the team used X-ray fluorescence spectroscopy to create maps showing where particular elements occurred across the image. Those maps exposed distinct colour layers and an underlying sketch that was difficult to see in the damaged visible paint. Chemistry World’s report is the source for that account.
“Hidden” does not mean that a complete, perfectly legible second portrait was recovered. It means that signals associated with material beneath or within the visibly degraded surface formed patterns that were not apparent in ordinary viewing. The result is a more informative record of how the image was built and altered over time, not a photographic reconstruction of its original colours.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →How XRF turns material into a map
XRF is an analytical technique based on the characteristic X-rays emitted by elements after a material is excited by incoming radiation. Each element can produce a distinctive set of X-ray energies. A detector measures those energies, and software assigns the detected signal to locations on the object. Repeating the measurement across a grid produces an elemental map: a two-dimensional display of where a measured element is relatively more or less abundant.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
From excitation to an image
- Excitation: an X-ray source illuminates a small area of the painting. The incoming energy can displace inner-shell electrons in atoms in the paint.
- Emission: as the atoms return to a lower-energy state, they emit secondary, characteristic X-rays.
- Detection: a detector records the energies and intensities of those emissions. The energy pattern is used to associate signals with elements.
- Scanning: the instrument moves across the painting or examines successive positions. Each measurement receives coordinates.
- Mapping: the measurements are assembled into colour-coded maps, allowing researchers to compare elemental distributions with the visible portrait.
The maps therefore describe elemental distributions, not paint names. An element can occur in more than one compound, and a single historical paint layer can contain several elements. Dust, later repairs, salts, and the wall support can also contribute signals. Layered paintings make interpretation harder because the detector may receive information from more than one depth. For that reason, an element map by itself does not prove that a particular named pigment was used.
Why a chemical map can show more than the eye
Visible inspection records the light that reaches the observer after interacting with the current surface. If a paint layer has faded, darkened, flaked, or become covered by deposits, the surviving image may no longer show the boundaries between layers. XRF adds a different kind of contrast: two areas that look similar can have different elemental compositions, while a faint or obscured layer can still produce a detectable signal.
| Question | Visible inspection | XRF elemental mapping |
|---|---|---|
| What is measured? | Light, colour, texture and visible damage at the surface. | Characteristic X-ray signals associated with elements in the measured volume. |
| What pattern may become clear? | Shapes and tones that remain visually distinct. | Boundaries between materials or layers with different elemental distributions. |
| What happened in the Herculaneum report? | The portrait was visibly degraded. | Maps revealed colour layers and an underlying sketch not readily apparent in the visible painting. |
| What cannot be concluded automatically? | Visible colour alone does not identify a chemical recipe. | An elemental signal does not, by itself, establish one exact pigment or the painting’s original appearance. |
This is why the discovery matters even if the face remains difficult to read. The maps can preserve evidence of construction that would otherwise be lost when the surface deteriorates further.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
What the portrait can tell historians and conservators
Reconstructing the order of painting
Separate mapped layers can indicate that the image was not applied as one uniform coat. A visible contour may belong to a later layer, while a different elemental distribution underneath may correspond to an earlier stage. In the reported portrait, the maps showed colour layers and a sketch, giving investigators clues about the sequence of marks without requiring the damaged surface to be cleaned or repainted.
Distinguishing design from later damage
A faint line can be mistaken for a crack, stain, or accidental mark when viewed only in visible light. If a corresponding elemental pattern follows a coherent facial or clothing feature, it may support the interpretation that the line belongs to the artwork. That interpretation still requires specialists to compare the map with the painting, its stratigraphy, and other evidence; the news report does not provide a complete catalogue of every mapped feature.
Planning future conservation decisions
Elemental maps can help a conservator decide where the original material may survive and where later deposits or repairs complicate the surface. They can also provide a baseline for monitoring. The available account does not say that a treatment was performed on this portrait, which areas were cleaned, or what the final conservation result was. Mapping evidence should therefore be understood as documentation and interpretation, not as proof that the wall painting was restored.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
What “portable macro-XRF” means in the related conference record
The program for the American Chemical Society’s 2017 national meeting lists a presentation titled “Portrait of an ancient woman revealed by high resolution portable macro-XRF scanning.” The listed presenters are E. Del Federico, C. Kehlet, N. Barbi, M. Gironda and R. Alberti. The program is useful corroboration that a closely related study of an ancient woman’s portrait used high-resolution portable macro-XRF scanning. It should not be treated as proof that the program entry is the exact paper behind the Chemistry World news report, nor does it supply the scan settings or a full results dataset. The meeting program is available as a PDF from the American Chemical Society.
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesWhy portability matters
A portable instrument can be brought to an archaeological object or museum surface that cannot safely be removed for laboratory analysis. “Macro” describes a scanning arrangement intended to cover comparatively large areas while retaining spatial information useful for an artwork. The conference title indicates that portability and high-resolution scanning were part of that presentation; it does not establish the instrument’s working distance, spot size, scan time, radiation settings, or detector model for the Herculaneum portrait.
How to read an elemental map without overclaiming
Maps are persuasive images, but interpretation has several stages. A responsible reading keeps the measurement separate from the historical conclusion.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
- Start with the legend. Identify the element represented, the colour scale, and whether the display shows raw intensity, a normalized value, or a composite. A bright colour generally means a stronger recorded signal within that map, not a literal paint colour.
- Check the spatial relationship. Ask whether a signal follows a visible feature, appears only in exposed damage, or covers the entire wall support. A broad background signal may come from the plaster rather than the portrait.
- Consider depth and overlap. XRF can detect contributions from multiple layers. A signal beneath a surface coating may coexist with a signal from a later retouch or deposit.
- Compare several elements. A pattern becomes more informative when multiple maps and the visible image agree. One element alone is rarely enough to name a compound.
- Separate evidence from interpretation. “Element X is concentrated along this contour” is a measurement-based description. “This contour is a specific historical pigment” is a further identification that requires additional evidence.
The Herculaneum report supports the first-level conclusion: elemental maps exposed colour layers and an underlying sketch. It does not publish the element-by-element assignments needed to go further.
What is established—and what remains unknown
| Established by the available sources | Not established by those sources |
|---|---|
| The object is a degraded wall painting depicting a woman at Herculaneum, described as about 2,000 years old. | The exact findspot, dimensions, current owner, or complete object history. |
| X-ray fluorescence spectroscopy was used to produce elemental maps. | The instrument model, beam settings, detector, scan spacing, or total scan time. |
| The maps showed different colour layers and an underlying sketch that was not readily visible. | A confirmed list of pigments or a complete reconstruction of the original palette. |
| The ACS 2017 program lists a closely related portable macro-XRF presentation and names five presenters. | Whether that conference presentation and the news report concern exactly the same project or object. |
| The technique provided evidence about hidden material structure. | A reported restoration, treatment schedule, or final conservation outcome. |
Keeping these boundaries matters. Ancient-paint analysis often combines several methods, but the sources available for this account do not document such a combined campaign. It would be inaccurate to fill the gaps with a confident pigment list or to say that the woman’s original face has been recovered in full.
Windows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallOutdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchWhy the finding is important beyond one painting
Roman wall paintings are physical records as well as images. Their meaning can depend on preparatory lines, revisions, colour placement and the relationship between layers. Once a surface has degraded, conventional photography may preserve only the last readable stage. Elemental mapping can retain clues from earlier stages without requiring an investigator to scrape or expose them.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
The approach also changes how “damage” is understood. A painting may look almost blank in visible light yet contain a chemically coherent structure. That does not make every faint signal an intentional mark, but it gives conservators a way to test competing explanations while leaving the object in place. For museums and archaeological sites, the resulting maps can become a digital record that other specialists can revisit as interpretation improves.
Limits readers should keep in mind
- Element is not pigment: the same element can be present in different materials, so naming a pigment requires supporting analysis.
- Maps are not ordinary photographs: their colours are visualization choices and should not be read as the portrait’s original hues.
- Signals can overlap: the detector may receive information from paint, deposits, repairs and the wall support at once.
- Resolution has practical limits: a map can reveal a broad layer while remaining unable to resolve every brushstroke.
- Interpretation is conditional: the published account reports the discovery of layers and a sketch, not a complete technical reconstruction or treatment result.
The most defensible conclusion is therefore specific: XRF elemental mapping made otherwise obscure layers of a Herculaneum woman’s portrait visible as material patterns, including an underlying sketch. It expanded the evidence available to conservators and art historians without proving exactly which pigments created every mark or what the painting looked like when new.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →
