A brand manager approves a logo on screen, the bags arrive, and the corporate red looks closer to brick, or the light blue has turned greyish. Nothing went wrong in production: the colour met the paper. Choosing Pantone or CMYK on kraft follows different rules from printing on white office paper or a glossy brochure. This article explains why colours shift on brown kraft, which colour system to choose, and what a paper bag can and cannot reproduce, so your expectations and your artwork match before the order is placed.
Why brand colours look different on kraft
Printing inks are not opaque paint. A thin layer of ink lets part of the paper show through, so the colour you see is always ink plus paper.
- Natural brown kraft has its own warm, brown base. Every colour printed on it becomes darker and warmer. Yellows turn mustard, light blues lose brightness, pale pastels can almost disappear. Black, dark brown, deep red and dark green hold up best.
- Bleached (white) kraft gives a light, neutral base. Colours print cleaner and closer to what you see on a swatch, though still softer than on smooth coated paper, because kraft absorbs ink.
This is why a logo that looks vivid on a white website can seem pale on a brown bag. If bright, accurate brand colours are a priority, bleached kraft is usually the better base. If you like the natural look, design for it: choose colours that work with brown rather than against it. Our article on choosing paper for branded bags compares the main paper types.
Pantone or CMYK on kraft: what the difference means for a bag
Pantone (spot colours)
Each Pantone colour is mixed as a separate ink to a numbered recipe and printed from its own plate. The colour is laid down as one even layer. That makes Pantone the natural choice for logos and brand colours that must stay the same from one run to the next.
CMYK (process colours)
CMYK builds colours from four inks, cyan, magenta, yellow and black, combined as fine dots. It is designed for images with many colours. On absorbent bag paper, those fine dots spread, so CMYK colours are less precise and less stable than mixed spot colours.
Why most bag orders use Pantone
Vita Group prints in both systems, but about 95% of our orders are in Pantone. The reasons are practical: a bag design is usually a logo and a few brand colours, and those colours need to be consistent across runs and match the rest of the brand’s materials as closely as the paper allows. Our presses print up to eight colours (one 8-colour and three 6-colour flexographic presses), which is enough for most brand palettes in spot colours.
What can and can’t be printed on a paper bag
| Element | On a paper bag | Notes |
|---|---|---|
| Logos and text | Yes | Keep type at a readable size and weight |
| Solid colour fills | Yes | Including large areas and full-colour backgrounds |
| Patterns and flat illustrations | Yes | Built from solid colour areas |
| Fine lines and small details | Depends on the paper | Checked by prepress for the chosen paper |
| Smooth gradients | No | Break into steps or uneven spots |
| Photographic images | No | Need fine tonal detail the paper cannot hold |
Solid fills: yes
Flat areas of colour are where flexographic printing is strongest. A bag printed in one solid brand colour, or a large block of colour behind a logo, is entirely realistic.
Gradients and photographs: no
Kraft paper has a fibrous, uneven surface. A smooth transition from one tone to another, or the subtle shading in a photograph, depends on very small dots of ink. On bag paper these dots do not sit evenly, so a gradient breaks into visible bands or blotches, and a photograph loses its detail. We do not print smooth gradients or photographic images. If your design uses them, replace the gradient with two or three solid tones or a pattern, and turn a photo into a flat illustration.
Fine lines: depends on the paper
Very thin lines, small serifs and small reversed-out text (light letters on a dark background) can fill in or break up. How fine is too fine depends on the paper. Our prepress team checks this on your artwork and tells you if something needs to be thicker.
How to specify colours for a paper bag
- Give Pantone references, not screen colours. Write the Pantone number for each colour in the file and in the order. “The red from our website” cannot be printed reliably.
- Use an uncoated swatch as your reference. Pantone guides show each colour on coated and uncoated paper. Kraft is uncoated, so the uncoated swatch is a more honest preview.
- Tell us the paper with the colours. The same Pantone reference will look different on natural and bleached kraft. Judge the colour against the paper you are ordering.
- Avoid very light tints on brown kraft. Pale colours lose contrast on a brown base.
- Keep the number of colours in mind. Up to eight fits our presses, and fewer colours usually means simpler setup.
Why a logo can look pale on kraft, and what to do
When a logo looks weak on a brown bag, the cause is almost always one of three things: a light colour on a dark paper, a thin typeface, or a colour chosen from a screen instead of a swatch. The fixes are equally simple: choose a darker or stronger shade for the kraft version of the logo, use a bolder weight, or move to bleached kraft. Many brands keep a separate “kraft version” of their logo colours for exactly this reason.
The bottom line
On a paper bag, the colour you see is ink plus paper. Natural kraft darkens and warms every colour; bleached kraft keeps them cleaner. Pantone is the reliable choice for brand colours, which is why about 95% of our orders use it, while CMYK is less precise on absorbent paper. Solid fills, logos and patterns print well; smooth gradients and photographs do not; fine lines depend on the paper. Specify colours as Pantone references, check them on an uncoated swatch and against the paper you have chosen, and the bags will look the way you expect.
Not sure how your brand colours will look on kraft? Send us your artwork with Pantone references, and our prepress team will check it for the paper you have in mind.