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What Is UV Ink? How It Works, Types, Benefits and Applications
UV ink is a specialized digital printing ink that cures when exposed to ultraviolet light.
Unlike ordinary aqueous or solvent-based ink, UV ink does not rely mainly on absorption or long evaporation times. A compatible UV printer applies the ink directly to the product surface and uses built-in UV LED lamps to cure the printed layer during production.
This printing method makes it possible to decorate many rigid, coated and non-porous products, including:
- Segni acrilici
- Custodie telefoniche
- Piastre metalliche
- Wood panels
- Prodotti in vetro
- Plastic promotional items
- Ceramic gifts
- Product packaging
- Portachiavi
- Custom labels
Modern UV printing systems may combine CMYK color ink with white ink, clear varnish and, on selected machines, primer. These additional channels allow businesses to print on transparent and dark materials, produce spot-gloss effects and create raised or textured designs.
However, UV ink is not a universal ink that can be used in any printer. The ink must be compatible with the printer, printhead, ink-delivery system, UV curing lamps, RIP software and intended printing materials.
This guide explains what UV ink is, how it works, the main UV ink types, suitable materials, advantages, limitations, maintenance requirements and how to choose the right ink system.
UV Ink at a Glance
| Articolo | UV ink characteristics |
|---|---|
| Metodo di stagionatura | UV LED light |
| Standard colors | Cyan, magenta, yellow and black |
| Specialty channels | White, varnish and primer |
| Primary applications | Hard and coated products |
| Common materials | Acrylic, glass, metal, wood and plastic |
| Metodo di stampa | Direct surface printing |
| Drying requirement | No separate air-drying stage |
| Main advantage | Fast curing and broad product range |
| Limitazione principale | Adhesion varies between materials |
| Attrezzatura richiesta | Compatible UV printer |
For a complete overview of UV printer structures, workflows and applications, see the EraSmart UV printer complete guide.
How Does UV Ink Work?
A UV printer uses inkjet printheads to place extremely small droplets of liquid UV ink directly onto the product surface.
The printer’s UV LED lamps then expose the ink to ultraviolet energy. This starts a curing reaction that changes the liquid ink into a fixed printed layer.
A typical UV printing workflow includes:
- Preparing the artwork in design or RIP software
- Cleaning and positioning the product
- Setting the print height and printing parameters
- Printing CMYK, white or varnish layers
- Curing the ink with UV LED light
- Inspecting adhesion, color and surface finish
- Removing the finished product from the printer
Because curing happens during printing, products can usually move to inspection, packing or further processing without waiting for a long drying period.
UV curing is different from ordinary ink drying
Traditional ink may dry through:
- Absorption into paper
- Water evaporation
- Solvent evaporation
- External heating
UV-curable ink behaves differently. It remains mainly on the material surface and becomes a solid ink layer when exposed to the printer’s UV light.
This surface-printing process helps produce:
- Sharp text
- Dettagli raffinati
- Dense colors
- White underlayers
- Gloss highlights
- Raised textures
- Multilayer graphics
The final result still depends on the printer settings, lamp output, ink formulation, layer thickness and substrate.
What Is UV Ink Made Of?
UV ink is a carefully formulated chemical system rather than a simple mixture of pigment and water.
Its exact composition varies by manufacturer and ink model, but the main components generally include the following.
Pigmenti
Pigments create the visible color.
Standard UV printers commonly use:
- Ciano
- Magenta
- Giallo
- Nero
Depending on the machine configuration, additional colors may include:
- Bianco
- Light cyan
- Light magenta
- Rosso
- Orange
- Vernice trasparente
Reactive monomers and oligomers
These components help create the cured ink film.
They can influence:
- Adesione
- Hardness
- Flessibilità
- Resistenza ai graffi
- Surface texture
- Chemical resistance
- Gloss level
Fotoiniziatori
Photoinitiators respond to ultraviolet energy and help begin the curing reaction.
The ink formulation and UV lamp system must work together. An ink designed for one printer should not automatically be considered compatible with another UV system.
Functional additives
Additives may be used to control:
- Viscosità
- Tensione superficiale
- Flusso di inchiostro
- Stabilità di stoccaggio
- Wetting behavior
- Adesione
- Lucentezza
- Curing performance
Small differences in formulation can significantly affect printhead performance and substrate adhesion.
Main Types of UV Printer Ink
A UV printer may use several different ink channels, each performing a specific function.
CMYK UV Ink
CMYK ink creates the main color image.
The four standard channels are:
- Ciano
- Magenta
- Giallo
- Nero
They are used to reproduce:
- Logos
- Photographs
- Illustrations
- Product labels
- Decorative patterns
- Text
- Packaging graphics
The final appearance depends on more than the CMYK values in the artwork. It can also be affected by:
- Substrate color
- Surface texture
- Sottobase in inchiostro bianco
- Profilo RIP
- Risoluzione di stampa
- Number of passes
- Ink density
- Curing settings
Printing the same image on white acrylic, clear acrylic and dark metal can therefore produce different results.
Inchiostro UV bianco
White ink is one of the most valuable capabilities of a UV printer.
It allows the printer to produce visible designs on:
- Transparent acrylic
- Bicchiere
- Dark plastic
- Colored metal
- Legna
- Dark promotional products
White ink can be used in several ways.
White underbase
A white layer is printed beneath CMYK to prevent the substrate color from changing the appearance of the design.
This is particularly useful for:
- Black phone cases
- Acrilico colorato
- Dark wood
- Prodotti in metallo
- Transparent materials
White backing layer
When printing on the back of transparent acrylic or glass, white ink can be printed behind the color image to improve opacity and visibility from the front.
Standalone white graphics
White ink may also be printed independently for:
- White logos
- Text
- Decorative patterns
- Frosted-style effects
- Minimalist product designs
Multilayer printing
Some UV workflows use several layers, such as:
- Color + white
- White + color
- Color + white + color
- White + color + varnish
The correct layer order depends on how the finished product will be viewed.
For a deeper explanation of these channels, read the EraSmart UV ink guide for CMYK, white and varnish.
Clear Varnish Ink
Varnish is a transparent UV-curable ink used to change the appearance and texture of selected print areas.
It can create:
- Spot-gloss effects
- Raised logos
- Simulated embossing
- Textured patterns
- Decorative highlights
- Tactile lettering
- Premium product finishes
Varnish is normally printed as an additional layer rather than replacing CMYK or white ink.
The quality of a varnish effect depends on:
- Preparazione dell'opera d'arte
- Number of printed layers
- Curing performance
- Material height
- Nozzle condition
- RIP print mode
Raised varnish effects may require multiple passes, which increases production time and ink consumption.
Primer
Primer is a clear adhesion-support layer that can improve UV ink bonding on selected difficult surfaces.
It may be useful for:
- Bicchiere
- Metallo
- Smooth plastic
- Ceramica
- Coated promotional products
- Other low-adhesion materials
Primer can sometimes be applied manually, while selected UV printers support primer as an ink channel.
However, primer does not make every material automatically printable. The product still needs to be:
- Pulito
- Asciutto
- Properly positioned
- Compatible with the primer
- Tested before full production
Always perform an adhesion test before accepting a large order.
Hard UV Ink vs Flexible UV Ink
UV inks may also be classified according to the flexibility of the cured ink layer.
Hard UV ink
Harder formulations are generally intended for rigid products that do not bend significantly.
Typical applications include:
- Acrylic panels
- Piastre metalliche
- Wood boards
- Bicchiere
- Piastrelle in ceramica
- Rigid plastic products
Potential advantages include:
- Firm surface
- Sharp detail
- Good scratch resistance
- Strong decorative finish
The limitation is that the ink layer may crack if the product bends or flexes beyond the ink’s capability.
Flexible UV ink
Flexible formulations are designed to tolerate more movement.
Possible applications include:
- Flexible plastic
- Film
- Leather-like products
- Articoli curvi
- Products with minor bending
Flexible UV ink is still not normally the first choice for stretch garments. Apparel-focused production is generally better suited to DTF or DTG technology.
See the comparison between UV printers and DTF printers when deciding between hard-product and textile printing.
What Materials Can UV Ink Print On?
UV printing supports a broad range of products, but material compatibility should always be tested.
| Materiale | Prodotti comuni | Main consideration |
|---|---|---|
| Acrilico | Signs, photo blocks, awards | White ink may be required |
| Bicchiere | Decorative panels and gifts | Primer may improve adhesion |
| Metallo | Nameplates, signs and cards | Remove oil and contamination |
| Legna | Ornaments, signs and décor | Grain affects print appearance |
| Plastica | Phone cases and promotional items | Plastic chemistry varies |
| Ceramica | Tiles and coated products | Perform adhesion testing |
| Leather-like materials | Wallets, covers and accessories | Check flexibility |
| PVC | Cards, signs and displays | Confirm ink compatibility |
| Cardboard | Campioni di imballaggio | Surface coating affects adhesion |
| Coated products | Regali personalizzati | Coating quality is critical |
The phrase “UV printing works on almost anything” should be treated carefully. A material may physically fit inside the printer but still have poor ink adhesion.
For more detailed substrate guidance, read the EraSmart UV printer materials guide.
Acrilico
Acrylic is one of the most popular UV printing materials.
It can be used for:
- Business signs
- Wedding signs
- Photo blocks
- Awards
- Menu boards
- Desk displays
- Decorative panels
Transparent acrylic often uses white ink as a backing layer or underbase.
Back-printing can also protect the printed image behind the acrylic surface.
Bicchiere
UV printing can decorate:
- Glass panels
- Bottles
- Awards
- Prodotti fotografici
- Decorative items
Glass surfaces are smooth and non-porous, so adhesion testing is essential.
Cleaning, primer or pretreatment may be required depending on the glass and intended use.
Metallo
Metal UV printing applications include:
- Nameplates
- Product labels
- Control panels
- Aluminum signs
- Business cards
- Equipment plates
Oil, dust and protective coatings can reduce adhesion. The surface should be cleaned using a method suitable for the material.
Legna
UV ink can be used on:
- Segni di legno
- Ornamenti
- Gift boxes
- Decorative boards
- Furniture components
Natural wood grain may remain visible through the print. White ink can be used to create a more consistent color base.
Plastica
Plastic is widely used for:
- Custodie telefoniche
- USB products
- Promotional gifts
- Cards
- Confezione
- Device covers
There are many different plastic formulations. Some accept UV ink easily, while others require primer or surface treatment.
Always test the exact product rather than assuming all plastics behave the same way.
What Products Can Be Made With UV Ink?
A small or commercial UV printer can support many product categories.
Popular applications include:
- Custodie per telefoni personalizzate
- Segni acrilici
- Nameplates
- Portachiavi
- Metal cards
- Product labels
- Promotional gifts
- Wood ornaments
- Campioni di imballaggio
- Pannelli fotografici
- Desk signs
- Control panels
- Awards
- Decorative tiles
You can explore more ideas in EraSmart’s guide to things to print with a UV printer.
Advantages of UV Ink
Fast Curing
UV ink is cured during the printing process.
This reduces the need for:
- Long drying periods
- Drying racks
- Separate drying tunnels
- Heat-transfer processes
- Extended production waiting time
The completed product can usually move quickly to inspection and packaging.
Direct Printing
UV printers can print directly onto the product surface.
This can eliminate the need for:
- Transfer paper
- Adhesive film
- Heat pressing
- Screen preparation
- Printing plates
Direct printing can simplify short-run and personalized production.
Broad Product Range
One UV printer may produce several product categories, such as:
- Segni acrilici
- Custodie telefoniche
- Regali in legno
- Targhette in metallo
- Prodotti promozionali
- Campioni di imballaggio
This makes UV printing attractive for small customization studios that want to serve several markets.
White Ink Capability
White ink allows printing on:
- Dark products
- Colored materials
- Transparent acrylic
- Bicchiere
- Backlit graphics
Without white ink, CMYK colors may appear weak or transparent on these products.
Varnish and Texture Effects
Varnish can increase perceived product value through:
- Spot gloss
- Raised branding
- Simulated embossing
- Tactile patterns
- Decorative textures
These effects can help a small printing business offer premium product options.
Variable-Data Production
Because UV printing is digital, the artwork can change from one product to the next.
Questo è utile per:
- Customer names
- Serial numbers
- Personalized photographs
- Different company logos
- Individual product designs
- Small-batch variations
Limitations of UV Ink
A Dedicated UV Printer Is Required
UV ink should never be added to an ordinary office inkjet printer.
A suitable UV printing system requires:
- Compatible printheads
- UV-resistant ink lines
- Appropriate dampers
- UV curing lamps
- RIP Software
- Safety shielding
- Maintenance functions
Using incompatible ink may damage the printer.
Adhesion Is Material-Dependent
UV ink can print on many materials, but adhesion is not guaranteed.
Potential problem surfaces include:
- Untreated glass
- Silicone-containing products
- Low-surface-energy plastics
- Oily metal
- Flexible materials
- Contaminated surfaces
Cleaning, primer or professional surface treatment may be necessary.
UV Ink Is Not Ideal for Standard Clothing
UV ink forms a cured layer on top of the surface.
On soft or stretchy clothing, this layer may:
- Feel stiff
- Crack
- Buccia
- Reduce fabric flexibility
For textile products, DTF or DTG is usually more appropriate.
Product Height Must Be Controlled
A UV flatbed printer requires a safe distance between the printhead and product.
Problems may occur when the product is:
- Warped
- Uneven
- Too tall
- Poorly secured
- Positioned incorrectly
Incorrect height can reduce print quality or cause a printhead collision.
White Ink Requires Maintenance
White ink contains dense pigment that can settle over time.
Without correct circulation and maintenance, problems may include:
- Weak white output
- Missing nozzles
- Ink-line deposits
- Damper blockage
- Intasamento della testina di stampa
Ink Cost Is Not the Only Operating Cost
UV printing expenses may also include:
- Cleaning solution
- Waste ink
- Maintenance parts
- Primer
- Fixtures
- Prodotti falliti
- RIP Software
- Lavoro
- Elettricità
- Printhead replacement
Read EraSmart’s guide on how much UV printing costs for a broader cost overview.
UV Ink vs Other Printing Inks
| Caratteristica | Inchiostro UV | Inchiostro DTF | Inchiostro per sublimazione | Inchiostro DTG |
|---|---|---|---|---|
| Prodotti principali | Rigid and coated products | Trasferimenti di tessuti | Polyester and coated gifts | Stampa diretta su indumenti |
| Metodo di stagionatura | UV light | Indurimento delle polveri e pressatura a caldo | Heat transfer | Heat curing |
| Inchiostro bianco | Common | Common | Normally unavailable | Common |
| I migliori materiali | Acrylic, wood, metal, glass and plastic | Cotone, poliestere e miscele | Polyester and polymer coatings | Primarily suitable garments |
| Sensazione di superficie | Cured surface layer | Strato di trasferimento flessibile | Dye becomes part of material | Ink printed directly onto garment |
| Varnish option | Disponibile | Normally unavailable | Unavailable | Normally unavailable |
| Heat press needed | NO | SÌ | SÌ | Used for curing |
UV ink is usually best for direct decoration of hard products.
Sublimation may be better for coated mugs, mousepads and polyester goods. See UV printing vs sublimation for a more detailed comparison.
Why White UV Ink Needs Special Maintenance
White UV ink contains a high concentration of opaque pigment.
When the ink remains still for an extended period, the pigment may begin to settle.
This can lead to:
- Reduced opacity
- Uneven white output
- Missing nozzles
- Ammortizzatori bloccati
- Ink-line deposits
- Printhead damage
Modern UV printers may include:
- Circolazione dell'inchiostro bianco
- Agitazione automatica
- Scheduled cleaning
- Ink refresh functions
- Automatic nozzle maintenance
These systems reduce risk but do not eliminate the need for regular operator maintenance.
Follow the maintenance routine specified for the printer rather than applying a generic schedule.
IL EraSmart UV printer maintenance guide explains daily, weekly and idle-period considerations.
Common UV Ink Problems
UV Ink Does Not Adhere
Le possibili cause includono:
- Dirty material
- Oil or fingerprints
- Incompatible plastic
- Insufficient curing
- Incorrect ink
- Primer mancante
- Low-energy surface
Recommended actions include:
- Clean the product correctly.
- Confirm that the ink is compatible with the substrate.
- Test another print mode.
- Apply approved primer if necessary.
- Perform an adhesion test before production.
The Print Feels Sticky
Le possibili cause includono:
- Incomplete curing
- Excessive ink density
- Incorrect lamp settings
- Thick varnish layers
- Inchiostro incompatibile
Stop production and check the printer, ink and curing settings. Do not assume that repeatedly exposing the product to UV light will always solve the problem.
White Ink Looks Weak
Le possibili cause includono:
- Pigment settling
- Missing nozzles
- Low white density
- Incorrect artwork layers
- Ink-system contamination
Run the printer’s approved white-ink maintenance process and perform a nozzle check.
Varnish Looks Uneven
Le possibili cause includono:
- Incorrect varnish artwork
- Perdita dell'ugello
- Uneven product height
- Excessive layer thickness
- Incorrect varnish print mode
Printed Color Does Not Match the Screen
Le possibili cause includono:
- Profilo ICC errato
- Missing white underbase
- Substrate color
- Incorrect RIP settings
- Excessive ink density
- Different curing behavior
Color should be evaluated using physical printed samples, not only a computer monitor.
Is UV Ink Safe?
Uncured UV ink should be handled as a chemical product.
Possible hazards may include:
- Skin irritation
- Eye irritation
- Allergic reactions
- Respiratory irritation
- Environmental hazards
Always follow the Safety Data Sheet supplied with the ink.
Recommended precautions include:
- Wear suitable protective gloves.
- Avoid skin and eye contact.
- Use eye protection when handling spills.
- Maintain suitable ventilation.
- Keep ink containers closed.
- Keep ink away from food and children.
- Follow local disposal regulations.
- Clean spills using approved procedures.
Do not automatically assume that a cured UV print is approved for:
- Direct food contact
- Medical products
- Children’s products
- Skin-contact products
- Regulated packaging
Suitability depends on the specific ink, product, curing performance and applicable regulations.
How Should UV Ink Be Stored?
Storage instructions vary between ink formulations, so the product label and technical documentation should always take priority.
General practices include:
- Store ink in the original container.
- Keep containers sealed.
- Protect ink from direct sunlight.
- Avoid excessive heat.
- Avoid freezing.
- Registra la data di apertura.
- Utilizzare prima le scorte più vecchie.
- Keep ink clearly labeled.
- Do not mix expired and fresh ink.
- Follow the stated shelf life.
Do not transfer UV ink into an unmarked container.
How to Choose the Right UV Ink
Confirm the Printer Model
Choose ink that is approved or verified for the specific printer.
Controllo:
- Modello della stampante
- Testina di stampa
- Sistema di distribuzione dell'inchiostro
- Cartridge or bottle type
- UV lamp system
- RIP Software
- Ink-channel configuration
Do not select ink only because the bottle size fits the printer.
Identify Your Main Products
List the products your business intends to print.
Per esempio:
- Segni acrilici
- Custodie telefoniche
- Metal cards
- Prodotti in vetro
- Regali in legno
- Piastrelle in ceramica
- Campioni di imballaggio
The ink formulation should match the intended substrates and required flexibility.
Choose the Correct Ink Configuration
Common UV printer configurations include:
- CMYK
- CMYK + Bianco
- CMYK + Bianco + Vernice
- CMYK + White + Primer
- Expanded-color systems
A business printing dark phone cases and transparent acrylic will normally benefit from white ink.
A business offering premium decorative products may also benefit from varnish.
Evaluate White Ink Requirements
White ink expands the range of printable products, but it also increases:
- Manutenzione
- Consumo di inchiostro
- Cleaning requirements
- Production complexity
The benefits should be compared with the products you plan to sell.
Evaluate Varnish Requirements
Varnish may be valuable for:
- Raised logos
- Spot-gloss products
- Textured acrylic
- Decorative phone cases
- Premium packaging samples
- Tactile promotional products
It may not be necessary for a business focused only on standard flat color printing.
Test Ink and Material Compatibility
Before production, print test samples on the exact material.
Evaluate:
- Adesione
- Colore
- White opacity
- Resistenza ai graffi
- Flessibilità
- Varnish finish
- Curare
- Long-term appearance
Do not rely only on a generic material name such as “plastic” or “metal.”
Consider Technical Support
Before selecting a UV ink or printer, confirm the availability of:
- Inchiostro
- Cleaning solution
- Waste consumables
- Capping stations
- Dampers
- Testine di stampa
- Supporto RIP
- Technical service
- Warranty coverage
A low ink price does not compensate for unstable production or missing technical support.
Is UV Ink Suitable for a Small Custom Printing Business?
UV printing can be a strong choice for small studios focused on custom hard-surface products.
Potential products include:
- Custodie telefoniche
- Placche acriliche
- Desk signs
- Portachiavi
- Metal cards
- Nameplates
- Wood ornaments
- Regali aziendali
- Prodotti promozionali
- Product packaging samples
A compact UV printer allows businesses to produce short runs without screens, printing plates or transfer paper.
However, profitability depends on:
- Product demand
- Consumo di inchiostro
- Costo del materiale
- Fixture preparation
- Failed-product rate
- Manutenzione
- Selling price
- Efficienza produttiva
Before purchasing equipment, compare working size, ink channels, material height and production requirements in the EraSmart UV printer range.
Modello entry-level compatto con testina di stampa L800, ideale per piccoli oggetti e progetti di hobby (dimensione di stampa 120*210 mm).
Testina di stampa L800 con dimensioni di stampa 210*290 mm, perfetta per piccole imprese e regali personalizzati (altezza di stampa 0-130 mm).
Testina di stampa DX7 con formato di stampa 350*450 mm, piattaforma di aspirazione e CMYK+WW+VV per produzione di volumi elevati.
Testina di stampa XP600 con dimensioni di stampa 350*450 mm, velocità 5㎡/H, ideale per tirature di produzione medio-grandi.
Doppie testine di stampa XP600 con velocità di 5,5㎡/H, CMYK+WW+VVVVVV per gamma cromatica e produttività migliorate.
Doppie testine di stampa XP600 con dimensioni di stampa 350*450 mm, progettate per la produzione continua di livello industriale.
Stampante di grande formato 420*600 mm con doppia testina XP600, perfetta per segnaletica, pannelli e materiali di grandi dimensioni.
Doppie teste XP600 con laminazione automatica, specializzate per la stampa di pellicole UV DTF (larghezza fino a 350 mm).
Specializzato per custodie per telefoni (TPV/PVC/legno/metallo), con display da 10 pollici e altezza regolabile da 0 a 10 mm.
Pensieri finali
UV ink is a specialized ink system that cures under ultraviolet light and creates a printed layer directly on a compatible product surface.
Its main advantages include:
- Fast curing
- Direct printing
- Broad hard-material compatibility
- Inchiostro bianco
- Varnish and texture effects
- Short-run customization
Its main limitations include:
- Need for a dedicated UV printer
- Material-dependent adhesion
- White-ink maintenance
- Chemical-handling requirements
- Limited suitability for stretch fabrics
- Possible need for primer and fixtures
The best UV ink is not simply the brightest or least expensive option.
It is the ink that matches:
- The printer
- The printhead
- The UV curing system
- The RIP software
- The substrate
- The required finish
- The production environment
EraSmart provides compact and commercial UV printer solutions for phone cases, acrylic, promotional products, signs, packaging samples and other custom hard-surface applications.
Domande frequenti
What is UV ink?
UV ink is a specialized printing ink that cures when exposed to ultraviolet light inside a compatible UV printer.
How does UV ink cure?
The printer’s UV LED lamps expose the freshly printed ink to ultraviolet energy, starting a reaction that converts it into a fixed printed layer.
Does UV ink dry instantly?
UV ink is normally cured quickly during printing. Complete curing still depends on the ink formulation, UV lamp, print mode and layer thickness.
Can UV ink print on glass?
Yes, but some glass products may require cleaning, primer or another pretreatment to achieve reliable adhesion.
Can UV ink print on plastic?
UV ink can print on many plastics, but plastic formulations vary. The exact product should be tested before production.
Can UV ink print on metal?
Yes. Metal should be cleaned to remove oil, dust, fingerprints and surface contamination before printing.
Is UV ink waterproof?
A properly cured UV print may provide good water resistance during normal use. Performance still depends on the substrate, adhesion and intended environment.
Can UV ink be used in a regular inkjet printer?
No. UV ink requires a compatible ink system, printhead and UV curing hardware.
Does UV printing require a heat press?
No. UV ink is cured by UV light rather than being transferred with heat.
Can UV ink print on T-shirts?
UV ink is generally not recommended for standard stretch clothing. DTF or DTG is normally more suitable.
What is white UV ink used for?
White UV ink is used as an underbase, backing layer or standalone white graphic on transparent, dark and colored materials.
What is UV varnish ink?
UV varnish is a clear ink channel used to create gloss, raised and textured effects.
Does UV ink require primer?
Some materials print well without primer. Glass, metal and certain plastics may require primer or pretreatment.
Why does white UV ink need circulation?
White ink contains dense pigment that can settle during idle periods. Circulation and maintenance help keep the pigment distributed and reduce clogging risk.
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