Dye Ink vs Pigment Ink in CIJ Printing: Which Should You Choose?

Choosing between dye ink and pigment ink is one of the most important decisions in continuous inkjet printing. Both can create durable production codes when matched to the correct application, but they achieve colour and contrast in different ways. The best option depends on the substrate, background colour, required visibility, production environment and maintenance routine.

This comparison focuses on industrial CIJ coding for dates, batch numbers, serial data, logos and machine-readable codes.

How dye ink works in CIJ printing

In a dye-based ink, the colourant is dissolved in the liquid carrier. This helps the ink move uniformly through the printer and makes dye inks a common choice for high-speed, everyday industrial coding. They are available in different colours and formulations for plastic, glass, metal, film, coated paper and other materials.

Dye ink is often a strong choice when the substrate is light enough to create clear contrast. A dark code on a white carton, clear bottle or light-coloured film can be easy to read without using an opaque ink. Special dye formulations may also address adhesion, fast drying or resistance requirements, but every application should be tested on the actual material.

How pigment ink works in CIJ printing

Pigment ink contains fine colour particles dispersed in the liquid. These particles can provide greater opacity, which is useful when a transparent-looking dye code would disappear against a dark surface. Light-coloured pigment ink can create a highly visible mark on black cable, dark plastic, rubber, coloured glass or other low-contrast materials.

Because pigment particles must remain evenly dispersed, the printer and ink-handling system need to be designed for pigment use. Appropriate circulation, startup, shutdown and maintenance procedures help preserve print quality. A standard dye-ink printer should not be converted to pigment ink unless the manufacturer specifically approves the configuration.

Dye ink vs pigment ink: key differences

Neither ink type is automatically more durable on every surface. Adhesion and resistance come from the complete formulation and its interaction with the substrate, not only from whether the colourant is a dye or pigment.

Start with background colour and required contrast

Look at the finished product under the lighting used by operators, cameras and customers. If a dark dye code remains clear and readable, it may be the simplest choice. If the background absorbs the colour visually or is too dark for sufficient contrast, an opaque pigment code can be more effective.

Contrast is especially important for small text and machine-readable symbols. A code that appears acceptable from one angle may fail under reflections, curved surfaces or variable lighting. Test samples should be evaluated at normal viewing distance and, where relevant, with the actual scanner or vision system.

Evaluate the real substrate, not only its material name

Two products described as “plastic” can behave very differently. Resin type, surface treatment, mould release, coating, contamination and temperature can change wetting and adhesion. The same applies to metals, glass and paper-based packaging.

For a useful trial, provide the exact production sample and document:

• Surface material, colour and coating
• Product temperature at the print station
• Required drying time before contact or packing
• Exposure to water, oil, chemicals, abrasion or refrigeration
• Required storage life and code legibility

Use a simple adhesion and durability test

Print several samples at the intended line speed and printhead distance. Allow the code to dry under realistic conditions, then perform the tests that match the product journey. These may include a dry rub test, tape test, water or condensation exposure, refrigeration, heat or contact with a relevant processing chemical.

Record the ink, printer settings and test result. This is more reliable than choosing an ink based only on a catalogue description. If the product changes supplier, coating or colour, repeat the validation.

Consider operation and maintenance

Good print quality depends on stable daily operation. Operators should follow the correct startup and shutdown procedure, keep the printhead clean and use approved fluids. Long idle periods require special attention, particularly with pigment systems, because suspended colour particles need the printer's designed circulation and maintenance process.

Consumables should be stored according to their labels and used within the recommended period. Mixing unapproved inks or make-up fluids can affect viscosity, drying, adhesion and printer reliability.

Which DAYSJET configuration fits each application?

For general date, lot and variable-data coding, start by reviewing the standard DAYSJET continuous inkjet printer range. Models such as the 1770-60 support versatile industrial messages, including text, barcodes and DataMatrix codes when the selected ink and application are compatible.

For dark surfaces that need an opaque, high-contrast code, the DAYSJET 1770-OPQ is a dedicated pigment ink configuration. Its 60U printhead is intended for applications where a standard dark dye code would not provide enough visual contrast.

Decision checklist

• Choose dye ink when it provides sufficient contrast and passes adhesion tests.
• Choose a pigment-capable system when an opaque code is needed on a dark surface.
• Do not assume that one ink suits every plastic, metal or glass product.
• Validate drying, adhesion and resistance with real production samples.
• Confirm that the printer is designed for the selected ink type.
• Train operators on the correct maintenance and consumable procedure.

If you are uncertain, send DAYSJET a substrate sample, background colour, desired code colour, line speed and resistance requirements. Contact the DAYSJET team to arrange an application review and sample-print evaluation.