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Black 4.0 is a real, unusually light-absorbing acrylic art paint that can make a three-dimensional object look like a flat silhouette or a hole in space. But it is not Vantablack, it is not a carbon-nanotube coating, and its often-repeated 99.95% absorption figure is a launch-era claim attributed to Stuart Semple—not a publicly available, independently verified specification.
For artists, model makers, prop builders, photographers, and hobbyist optical projects, Black 4.0 can be an impressive specialist paint. Its practical weaknesses are just as important as its blackness: the unsealed surface is vulnerable to fingerprints, rubbing, scratching, cracking, weather, and anything else that requires a protective clear coat.
What Black 4.0 actually is
Black 4.0 is a proprietary, water-based, ultra-matte acrylic paint made by Stuart Semple’s Culture Hustle. It was introduced in 2023 as the successor to Black 3.0. In practical terms, it is a consumer art material: it comes in a bottle, can be brushed or airbrushed, and is intended for paintings, sculpture, props, models, photography, exhibitions, and experiments.
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It is not a grown forest of vertically aligned carbon nanotubes, a vacuum-deposited optical coating, or Vantablack in a bottle. Culture Hustle’s public information does not establish that Black 4.0 contains carbon nanotubes. Its FAQ says the paint contains a small amount of carbon, is not really conductive, and should not be used around sensitive electronics. The complete formulation is proprietary.
In an interview with Hackaday, Semple attributed the improvement over earlier versions to changes in the resin or “super-base,” ingredient substitutions, and especially the order of addition, mixing process, and temperature. Culture Hustle says Black 3.0 was discontinued because thick applications could trap moisture and occasionally develop white, salt-like crystals; the company says Black 4.0 was reformulated for deeper and more stable coverage. That is a manufacturer explanation, not an independently published materials analysis.
Why does it look like a hole?
Black paint normally still reflects enough light to reveal highlights, shadows, edges, and curvature. Those reflections tell your eyes that a black object is rounded, raised, hollow, or textured.
An ultra-matte, highly absorbing surface suppresses many of those cues. On a three-dimensional object, the viewer can lose the small highlights that describe its form. Against a dark background, the result may look less like a painted object and more like a flat black cutout—or a void.
That effect is real, but it is conditional. It is strongest with controlled lighting, a smooth and evenly coated surface, and an appropriately dark background. Dust, fingerprints, a rubbed patch, uneven coverage, a glossy undercoat, or a change in viewing angle can restore enough reflection to reveal the object’s shape.
Hackaday’s indoor demonstrations describe surface texture and geometry apparently disappearing. Surrey NanoSystems uses similar black-hole language when describing three-dimensional objects coated with Vantablack S-VIS. In both cases, the visual demonstration should be understood as an appearance under particular conditions—not proof that the object has literally become invisible.
Photographs can exaggerate the effect. Cameras and phone apps routinely alter exposure, contrast, noise reduction, and black levels. A fair visual comparison needs identical lighting, camera settings, substrate, coating thickness, drying time, and framing. A side-by-side photograph is useful evidence of appearance, but it is not a reflectance measurement.
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Vantablack brought extreme black coatings into public attention. Surrey NanoSystems developed the original material from vertically aligned carbon nanotubes: incoming light enters the nanotube structure and has repeated opportunities to be absorbed rather than reflected. The result was an engineered coating for technical applications, not a normal artist’s paint.
The material also became part of an art-world dispute. In 2016, reporting by The Guardian described an exclusive arrangement giving artist Anish Kapoor artistic-use rights to Vantablack S-VIS. Stuart Semple responded by developing increasingly black consumer art paints, including Black 2.0, Black 3.0, and Black 4.0. The history is relevant context, but the commercial rivalry should not be mistaken for a scientific standard: ultrablack is a performance description, not one universally defined material category.
What do the absorption percentages mean?
If an opaque surface absorbs 99.95% of incident light, roughly 0.05% is left to be reflected, scattered, or otherwise returned toward the observer. At 99.8% absorption, the residual amount is roughly 0.2%. That means 0.05% is four times lower than 0.2%, even though the absorption figures differ by only 0.15 percentage points.
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That arithmetic is straightforward. The comparison is not. A percentage has meaning only alongside the conditions under which it was measured:
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problems- Wavelength range: visible-light absorption is not the same as performance across ultraviolet, visible, and infrared wavelengths.
- Angle of incidence: a coating can look excellent straight on while scattering more light at oblique angles.
- Surface preparation: substrate color, texture, primer, film thickness, and number of coats can all affect the result.
- Reflectance definition: a measurement of narrow specular reflection is not equivalent to total hemispherical reflectance, which includes diffuse scattered light.
- Application method: brushed and airbrushed films may have different thicknesses and surface structures.
- Instrument and uncertainty: without the test setup and uncertainty, decimal-level comparisons are easy to overinterpret.
For that reason, “Black 4.0 absorbs 99.95% of visible light” should be presented as a claim reported from the 2023 launch period, not as an independently verified universal specification. Culture Hustle’s current product page uses the less precise phrase “at least 99%,” while its 2026 editorial material says 99.8%+.
The broader scientific literature makes the same point: ultra-black performance can come from surface texture, optical trapping, gratings, etching, or specialized coatings, and those approaches are not interchangeable. A review of ultra-black coatings discusses why texture, angular behavior, and measurement method matter as much as a headline number.
Black 4.0 versus Vantablack and other ultra-black materials
| Material | What it is | Reported figure | Practical status |
|---|---|---|---|
| Black 4.0 | Water-based ultra-matte acrylic art paint | Current seller wording: at least 99%; Culture Hustle editorial copy: 99.8%+; 2023 Semple statement: 99.95% | Publicly purchasable; brushable and airbrush-compatible; intended mainly for indoor art, props, models, photography, and experiments |
| Original Vantablack | Engineered vertically aligned carbon-nanotube coating | Up to 99.965% under specified conditions | Specialist engineered coating, not an ordinary consumer paint |
| Vantablack S-VIS | Sprayable carbon-nanotube coating | Approximately 99.8% | Specialist coating for optical, scientific, aerospace, and related applications |
| Musou Black | Water-based acrylic paint | Manufacturer reports up to 99.4% airbrushed and 98.8% brushed | Consumer-accessible paint; fragile powdery surface; not recommended by its manufacturer for outdoor or automotive use |
| MIT 2019 ultrablack material | Vertically aligned carbon nanotubes on treated aluminum | At least 99.995% in the reported research | Research material, not a bottle of general-purpose art paint |
The original Vantablack figure comes from a different product and set of conditions than the S-VIS figure. Surrey NanoSystems’ Vantablack history cites up to 99.965% for the original material, while its information about Vantablack S-VIS reports approximately 99.8%. These should not be collapsed into one generic “Vantablack percentage.”
Nor is Black 4.0 literally the darkest material known. MIT researchers reported a carbon-nanotube material absorbing at least 99.995% of incoming light in 2019. That material is a research result, not a consumer art paint. The useful distinction is therefore not simply which number is largest:
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- Industrial coating prioritizes controlled optical and environmental performance, often at much greater cost and with specialist application requirements.
- Research material may achieve an exceptional laboratory result without being practical, durable, or commercially available as a paint.
Black 4.0 versus Musou Black
Musou Black is the most relevant consumer alternative. Its manufacturer reports up to 99.4% visible-light absorption when airbrushed and approximately 98.8% when brushed. It recommends repeated thin airbrushed layers for the best result and warns that the finish is low-durability and powdery. The manufacturer does not recommend it for outdoor or automotive use and says it does not suppress infrared reflection.
A 2024 comparison by Ansoken, a Japanese company associated with Musou Black, tested Black 4.0 and Musou Black with brush and airbrush applications. Ansoken concluded that Musou Black looked darker in both tests and produced lower reflectance in its measurements. That is useful comparative evidence, but it is vendor-affiliated evidence, not a neutral laboratory verdict.
The practical choice is more nuanced:
| Choose… | When it makes sense | Main compromise |
|---|---|---|
| Black 4.0 | You want a readily available art paint with a dramatic void effect and the option to brush or airbrush it. | High price per volume and a surface that should remain mostly untouched and unsealed. |
| Musou Black | You can airbrush, want a direct consumer alternative, and can tolerate a powdery, fragile finish. | Application method strongly affects the seller’s figure; it is not an outdoor, automotive, or infrared solution. |
| Black 2.0 | You need a very flat, uniform, non-sheeny base or a matte preparation layer under Black 4.0. | Culture Hustle positions it as less light-absorbing than Black 4.0, so it is not the choice for maximum void effect. |
A 2025 Jackson’s Art comparison reached a different kind of conclusion. In close swatches, the tester described Black 4.0 as the greyest of the compared ultra-black paints, but found it more versatile and better suited to broad application than some stiffer gouaches. The tester also reported fingerprints and tiny cracks as practical problems. This is hands-on art-supply testing, not optical-laboratory certification, but it is valuable because artists have to live with handling behavior rather than a headline percentage.
How to apply Black 4.0 properly
The preparation and drying stage matter as much as the paint itself. Follow the product-specific instructions rather than treating Black 4.0 like an ordinary black acrylic.
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- Work at room temperature. Avoid judging the final finish while the film is still wet.
- Prepare the substrate. Culture Hustle lists canvas, card, wood, paper, plaster, stone, foam, and most primed surfaces. Seal porous materials before painting. The Black 4.0-specific guidance calls for a mixture of
25% PVA and 75% water. - Prime slick surfaces. Shiny plastic, metal, or other smooth surfaces should not be assumed to accept the paint without preparation. Use Black 2.0 or a suitable matte primer, then test adhesion on a hidden area.
- Use a soft synthetic brush. Load as little paint as practical and lay down thin, even coats rather than pushing a thick puddle across the surface.
- Let each coat dry completely. The FAQ specifies at least two hours and recommends overnight drying when possible.
- Add coats only after drying. Several controlled thin coats are preferable to one thick coat, which can dry unevenly, trap moisture, or look grey rather than deeper black.
- Thin only cautiously with water. For airbrushing, water can be used, but there is no universal dilution ratio. Nozzle size, air pressure, equipment, and desired film thickness all matter. Test on scrap material before spraying the finished piece.
- Avoid additives. Flow improvers, acrylic mediums, varnishes, resins, and other additives can introduce sheen or alter the delicate matte surface. The safest default is the paint as supplied, with only a small amount of water when necessary.
Coverage, price, and what arrives at the door
Culture Hustle currently estimates that 60 ml covers approximately 1 square metre and 150 ml covers approximately 2 square metres when applied in thin, even coats. Treat those as seller estimates, not guarantees. Porosity, texture, sealing, number of coats, dilution, and application method can change coverage substantially.
The standard retail size is 150 ml. At the time of research, the UK product page listed that size at £49.99, with 1-litre and 6-litre options listed separately at approximately £229 and £1,150. A US catalog showed a standard product price of $49.99 and a 1-litre listing at $269. Prices, stock, shipping, taxes, and regional product pages can change, so check the live UK listing or US catalog before buying.
Using the seller’s 150 ml coverage estimate, the £49.99 bottle works out to roughly £25 per square metre before preparation materials and waste. A textured sculpture that needs several coats may cost more. It is specialty paint, not an economical substitute for ordinary matte black acrylic over a large area.
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Some buyers may notice a Black 3.0 image on the bottle. Culture Hustle says it reused some older bottles and applied a Black 4.0 label over the existing artwork. That explanation may account for confusing packaging; it is not, by itself, evidence that the contents are mislabeled.
Surface preparation and troubleshooting
It looks grey instead of black
Culture Hustle says this commonly happens when the coat is too thick or when Black 4.0 is applied over a shiny surface without suitable primer. Let the coat dry fully, check the surface under neutral lighting, and try a thinner coat over a properly matte base. Do not immediately compensate by adding more wet paint.
The coverage is patchy
The substrate may be absorbing the paint unevenly. Porous wood, plaster, paper, foam, and stone generally need sealing first. Once the sealer is dry, apply another thin, even coat rather than flooding the low areas with paint.
The surface has an unexpected sheen
Common causes include too much water, a flow additive, acrylic medium, varnish, resin, or another clear protective layer. Even a matte-labeled clear coat can change the surface reflection enough to weaken the void effect. Black 4.0’s unusual appearance depends on keeping the top surface extremely matte.
It rubs off or shows fingerprints
This is a fundamental trade-off, not necessarily a defective batch. Ultra-black finishes depend on a delicate low-reflection surface, and oils or abrasion can change its appearance. Jackson’s Art reported fingerprint marks and small cracks during hands-on testing. Handle the object by an unpainted area, use gloves when appropriate, and display it behind a barrier if the finish matters.
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The airbrush clogs
Black 4.0 is compatible with airbrush use, but the correct dilution depends on the specific nozzle and equipment. Do not rely on a single ratio copied from another paint. Strain or prepare a small test batch only if that is consistent with the manufacturer’s instructions and your equipment, and establish the water-to-paint ratio on scrap material before working on the final object.
It will not adhere to the surface
“Works on all surfaces” should not be interpreted as “needs no preparation.” Bare plastic and metal can be especially unreliable without a suitable primer. Test a small area, allow it to cure, and check it with gentle masking tape or fingernail pressure before committing to a large piece.
Durability: the limitation that marketing demonstrations often hide
Black 4.0 is primarily an indoor display and experimental finish. Culture Hustle says it is not a permanent outdoor paint and may wear or fade on cars and other exposed objects. The surface must remain unsealed to preserve the ultra-matte effect, but that also leaves it vulnerable to weather, dirt, ultraviolet exposure, abrasion, and handling.
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Do not solve the problem with a clear coat. Culture Hustle explicitly warns that varnish, resin, or another protective membrane adds shine and ruins the void effect. The finish is therefore best suited to objects that can be displayed without being touched.
- Cars: unsuitable as a durable automotive finish. Washing, road debris, weather, and contact will damage it, while a clear coat compromises the optical effect.
- Outdoor sculpture: acceptable mainly for temporary or easily retouched installations. For long-term outdoor work, consider a weather-resistant conventional matte finish or a professionally engineered coating.
- Wearable objects: poor for jewelry, costume parts, handles, shoes, or other high-contact surfaces because finger oils and friction quickly alter the appearance.
- Frequently handled models: use it selectively in recessed areas or choose a more durable matte black where the viewer will touch the piece.
Culture Hustle markets Black 4.0 as archival, but the public material reviewed does not establish independent archival certification. Treat that wording as a seller claim rather than a guarantee of museum-grade longevity in every environment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can Black 4.0 be used in photography and telescope projects?
Yes, potentially—especially where the visible-light priority is reducing stray reflections. It may be useful for indoor photography backdrops, light traps, model interiors, hobbyist telescope baffles, masks, and light-leak experiments. A NASA-linked eclipse-instrument paper discusses the importance of dark matte treatments for stray-light control and names Black 4.0 as an example of a newer generation of ultra-black matte paints. That paper points to possible future benefits; it does not qualify Black 4.0 for spaceflight or professional optical systems.
Professional optical hardware has requirements that an art-paint listing does not normally provide: wavelength-specific reflectance curves, angular performance, outgassing, adhesion, cleanliness, thermal cycling, temperature range, infrared behavior, and resistance to vacuum or radiation. Acktar’s optical-coating information illustrates this engineering approach, with coatings selected around operating wavelength, environmental conditions, adhesion, outgassing, and reflectance rather than one visible-light blackness number.
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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 & 11For a hobbyist telescope or camera, test Black 4.0 in the actual optical path and inspect it for flakes, dust, and unwanted reflections. For a detector, spacecraft component, observatory instrument, or any system with a quantified stray-light budget, use a coating or foil with the required technical documentation. A paint that looks black to the eye may still perform poorly in infrared or at oblique angles.
Black 2.0 has a different job
Culture Hustle positions Black 2.0 as less light-absorbing than Black 4.0 but flatter and more uniformly matte. That makes it useful when a consistent non-sheeny base matters more than the deepest possible void effect.
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- Use Black 4.0 when maximum visible-light absorption and the strongest disappearing-object effect are the priority.
- Use Black 2.0 as a matte base or primer on a slick surface, or when an extremely flat black is more useful than maximum absorption.
What independent evidence tells us—and what it does not
There is enough evidence to say that Black 4.0 is a distinctive ultra-matte art paint with a striking visual effect. There is not enough public evidence to settle a universal scientific ranking from the published percentages.
- Hackaday, 2023: identified the product, interviewed Stuart Semple, described the Vantablack context, and reported the apparent loss of texture and geometry in demonstrations. Its 99.95% figure is an attributed statement, not an independent test report.
- Ansoken, 2024: compared Black 4.0 and Musou Black using brush and airbrush applications and favored Musou Black in its observations and reflectance measurements. Because Ansoken is associated with Musou Black, the result needs commercial-conflict disclosure.
- Jackson’s Art, 2025: compared Black 4.0 with other ultra-black art paints and gouaches. It found Black 4.0 comparatively grey in close swatches but versatile for broad application, while also observing fingerprints and cracking. This is useful editorial handling evidence, not laboratory certification.
- Gonimetric research, 2026: a preprint comparing angular reflectance and scattering among black materials helps explain why viewing angle matters, but its abstract does not identify Black 4.0 as a tested sample. It should not be presented as a direct test of this paint.
The unresolved question is simple: where is the complete, public Black 4.0 measurement report? The sources reviewed do not provide one with all the details needed for a rigorous comparison. Until such data are available, the responsible wording is that Black 4.0 is marketed and demonstrated as ultra-black—not that the 99.95% number has been independently established across all visible wavelengths and viewing conditions.
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Who should buy Black 4.0?
Choose Black 4.0 if:
- You want a dramatic visible-light void effect for indoor art, props, miniatures, sculpture, dioramas, or photography.
- You prefer a brushable or airbrush-compatible acrylic rather than an industrial coating process.
- The painted surface can remain unsealed and mostly untouched.
- You accept a high cost per volume and understand that published absorption numbers are not directly comparable.
Choose Musou Black if:
- Airbrushing is acceptable and you want a direct consumer alternative.
- You are willing to trade durability for a fragile, powdery low-reflection finish.
- You will compare the results using the same application method, lighting, substrate, and number of coats.
Choose Black 2.0 if:
- You need a uniformly flat matte base or a preparation layer under Black 4.0.
- Surface uniformity and low sheen matter more than the deepest possible absorption.
Choose an engineered coating or optical foil if:
- The project involves telescope baffles, cameras, detectors, aerospace hardware, thermal-vacuum environments, or strict optical tolerances.
- You need documented infrared behavior, outgassing limits, thermal performance, adhesion, cleaning resistance, or a reflectance curve.
- The finish must survive conditions that make an unsealed art paint impractical.
Final verdict
Black 4.0 deserves its reputation as an unusually black, ultra-matte art paint. Under suitable indoor lighting it can make form disappear in a way ordinary black acrylic cannot, and it is far more accessible to artists than a specialist carbon-nanotube coating.
But calling it “the new Vantablack” is shorthand, not a material identity. Black 4.0 is an acrylic paint; Vantablack is a family of engineered coatings; and research materials have achieved higher reported absorption figures. The exact Black 4.0 percentage remains difficult to audit from the public documentation because current seller pages use multiple figures without publishing a complete test method.
Buy it for the visual effect, not for an unsupported record. If the object will be displayed indoors and left alone, Black 4.0 is a credible and exciting choice. If it must be touched, weatherproofed, washed, sealed, or qualified for professional optics, choose a different black—or accept that the deepest black and the most durable black are usually different products.
Frequently Asked Questions
Is Black 4.0 actually Vantablack?
No. Black 4.0 is a proprietary, water-based ultra-matte acrylic art paint. Vantablack refers to engineered carbon-nanotube coatings developed by Surrey NanoSystems. Black 4.0 can create a similar visual void effect in some situations, but the materials, applications, and publicly documented specifications are different.
Can Black 4.0 be varnished or covered with resin?
Not if you want to preserve its deepest matte effect. Culture Hustle says varnish, resin, and clear protective coatings add shine and ruin the void appearance. That is why the paint is better for display objects than for surfaces that must be handled or weatherproofed.
How many coats of Black 4.0 should I apply?
There is no universal coat count because the result depends on the substrate and application method. Seal porous surfaces, apply thin even coats, and allow at least two hours between coats, with overnight drying preferred. Several controlled coats are generally better than one thick coat.
Is Black 4.0 suitable for a professional telescope or camera?
It may be useful for hobbyist experiments involving visible-light stray reflections, but it is not automatically suitable for professional optical hardware. Professional systems may require documented performance for wavelength range, angular reflectance, infrared behavior, outgassing, adhesion, thermal cycling, cleanliness, and vacuum conditions. Use an engineered coating with the necessary specifications when those requirements matter.
},{
Why does my Black 4.0 look grey or patchy?
A thick coat, a shiny unprimed surface, or an unsealed porous substrate can make the finish look grey or uneven. Let the paint dry, seal porous materials, prime slick surfaces with a suitable matte primer, and reapply thin coats. Too much water or glossy additives can also introduce unwanted reflection.
The Bottom Line
Bottom line: Black 4.0 is a convincing ultra-black acrylic paint for indoor art and controlled experiments, not a proven drop-in replacement for Vantablack or a durable all-purpose coating. Choose it for a dramatic, touch-free visible-light effect; choose Musou Black for a comparable consumer alternative worth testing; choose Black 2.0 for a flatter base; and choose an engineered optical coating when performance, durability, infrared behavior, or environmental certification is the real requirement.
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.
