Printing Pantone Colours on Packaging: Spot vs CMYK Process and Colour Management

Colour consistency is one of the most argued topics between brands and packaging factories. When the boxes arrive and the logo looks brown instead of orange, the relationship breaks down fast. Colour matching is a technical process. Understanding it prevents disappointment.

Pantone Spot vs CMYK

Pantone (PMS) spot colours are pre-mixed inks — the factory buys a can of exactly PMS 485 Red and prints it as a single ink layer. CMYK process colour is four-colour halftone printing; cyan, magenta, yellow and black dots combine optically to simulate millions of colours. Key differences:

• Accuracy: Spot ink is exactly the Pantone formula. CMYK simulates it — accuracy depends on the press, substrate and calibration.
• Cost: Each spot colour requires a separate printing unit. On a 4-colour press, adding 2 spot colours means 6 passes or a 6-colour press.
• Scope: Some Pantone colours (fluorescents, metallics, some bright oranges) cannot be reproduced in CMYK at all.

When to Specify Spot Colour

• Brand-critical colours (logo, primary brand colour) that must be consistent across all packaging
• Metallic gold/silver — CMYK cannot simulate metallic finish; use Pantone 871 Gold or foil stamp
• Fluorescent colours
• When printing on dark or kraft stock where CMYK cannot achieve sufficient coverage

How to Specify Colour on Your Brief

Always specify both: PMS code for spot ink intent AND CMYK breakdown for process print fallback. Example: "Logo colour: PMS 485 Red (CMYK: 0C, 100M, 100Y, 0K). If 6-colour press not available, use CMYK."

Common Colour Failures

• Metamerism: Colour looks right under D50 light (standard print viewing) but shifts under fluorescent or warm light. Specify viewing conditions.
• Ink absorption into substrate: Uncoated kraft absorbs ink; colours appear 15–25% darker and less saturated. Always request a press proof on actual substrate.
• Dot gain: Halftone dots spread on press. 20–25% dot gain is typical for coated paper; higher on uncoated. Artwork should be adjusted for the target substrate.

Colour Approval Process at BestPackFactory

1. Digital proof (PDF or 3D mockup). 2. Pantone drawdown on actual substrate. 3. First sample on press. 4. Colour approval sign-off. Mass production is locked to the approved sample.