Colour Management for Packaging Print: Spot Colours, Process Builds and Brand Consistency

Colour is one of the most visible parts of packaging, and one of the easiest to get wrong. A brand colour that looks right on screen can drift between print runs, substrates and suppliers. Understanding how colour is specified and controlled keeps packaging consistent.

Spot colour or process build

A spot colour is a single ink mixed to a reference, usually a Pantone number. It gives a stable, repeatable brand colour and works well for logos and large flat areas. A process build, or CMYK, mixes four inks and is cheaper for full-colour images but can shift slightly between runs. Many packs use both: process for photography and a spot ink for the brand mark.

Why the substrate changes the colour

The same ink looks different on coated white board, uncoated kraft and recycled grey board. Coated stock holds ink on the surface and reflects more light, while uncoated stock absorbs ink and appears darker and warmer. Always approve a proof on the final material, not on a digital file or on a different board.

Proofs and approvals

A digital proof shows layout and content but not true ink colour. A press proof, or a proof on the production material, shows how the ink behaves on that substrate and is the reliable basis for sign-off. Keep the approved sample as the reference for later runs, and note the substrate, finish and lighting conditions with it.

Variables that move colour

• Ink film thickness and press settings
• Substrate shade, coating and absorbency
• Lamination or varnish, which can add warmth or change gloss
• Paper batch variation between mill deliveries
• Viewing light, since colour changes between daylight and store lighting

Controlling these is easier when one supplier and one substrate are used across a product range.

Finishing and colour

Matte lamination flattens contrast and makes colours look softer, gloss deepens them, and soft-touch adds a slight warm cast. Spot UV and foil change how the eye reads nearby printed areas. If a brand colour sits next to a special finish, approve them together rather than separately.

Practical steps for consistency

• Define each brand colour as a reference and record the substrate
• Approve a proof made on the production material under a stated light
• Standardise the finish across a product family
• Keep an approved sample for every subsequent run
• Check the first sheets of each run against the reference before the run continues

Summary

Consistent packaging colour comes from clear specifications and physical proofs, not from screen previews. Fix the ink, the substrate and the finish, approve them together, and hold a signed sample as the standard for every future order.

Key figures and tolerances

• Press approval tolerance: ΔE 2.0 or better under ISO 13655 measurement conditions (M1), with process control to ISO 12647-2.
• Solid ink density targets: black 1.40–1.60, cyan/magenta 1.35–1.50, yellow 1.00–1.15.
• Tone value increase at 50%: 12–20% on coated sheetfed, 15–25% on uncoated or recycled board (ISO 12647-2).
• Register tolerance: ±0.05–0.1 mm between colours.
• Spot colour to process match: typically ΔE 2–4; use a dedicated spot ink if you need below 2.
• Total ink coverage (TAC): keep at or below 300–320% on coated stock and 240–260% on uncoated or recycled board.
• Ranges are typical industry values for the material or process named and are not a specification; confirm the exact value, the current edition of each standard and the applicable grade with your supplier or test laboratory.