Colour Proof, Not Colour Guess: Auditing a Brand Palette Before It Embarrasses You

There's a specific kind of silence that follows the moment a client opens a printed proof and says, 'It looked brighter on my phone.' You know the one. The palette you were handed — usually a tidy row of hex codes in a PDF, sometimes a Canva board, occasionally a screenshot of a logo — has turned out to be a rumour rather than a specification. Your job is to turn it into something that behaves.

This isn't about being precious. It's about building a palette that survives the journey from a Figma frame to a litho press to a client's handset in a taxi. Here's the audit I run before any artwork leaves the studio.

First, find out what you've actually been given

Most inherited palettes are RGB-first. That's fine for screens and useless for a printer. Before you design anything, make a one-page source of truth: every colour with its hex, RGB, CMYK and — if it exists — Pantone reference. Label which one is authoritative. If the client says 'just use the hex', note that in writing and explain that hex is a screen value, not a print instruction.

Ask for the original brand guidelines, not a screenshot. If there aren't any, build the palette yourself and send it back for sign-off. A palette without an owner is a palette that will be argued about in week three.

RGB and CMYK are different languages, not dialects

RGB mixes light; CMYK mixes ink. Some RGB colours — electric blues, vivid greens, fluorescent oranges — simply don't exist in CMYK. When you convert, you're not translating, you're approximating. The trick is to convert deliberately and record the result. In Adobe apps, use Edit > Convert to Profile with the printer's ICC profile rather than Image > Mode > CMYK, which can make a mess of black text and rich blacks. In Affinity, check the document colour format before you start.

Then look at the numbers. A CMYK build of 75/68/65/80 for a dark grey is a warning sign. Too much ink, too little control. Aim for stable builds and avoid four-colour greys for body text. For small black type, 100% K. For large areas of solid black, a rich black build agreed with your printer — typically something like 60/40/40/100 — not a default.

Spot colours are lovely until they're expensive

Pantone is still the common language for spot colour in the UK, but check how your software is handling the library. Recent versions of Creative Cloud have moved some Pantone swatches behind a subscription, which means a file opened on a colleague's machine may lose its spot definitions. If a brand relies on a spot colour, keep a physical swatch book and a note of the Pantone number. For metallic, fluorescent or brand-critical colours, spot is often the only way to hit the target. It also adds a plate to the print job, so talk cost before you design a six-colour masterpiece.

If the client has a Pantone but the job is going digital, you need a CMYK or RGB equivalent that you've tested — not one you guessed from a screen.

Paper stock changes the colour more than your slider does

The same CMYK build looks different on coated, uncoated and recycled stock. Uncoated paper absorbs ink and spreads it; coated holds it tighter and looks glossier. Request a physical swatch from your printer or paper merchant — G . F Smith and Fedrigoni both do lovely sample books — and ask which stock the proof will be on. If you're printing via an online UK service like Printed.com or Solopress, check their stock options and order a sample pack before a big run.

Ask about the press profile too. ISO 12647-2 is the standard most UK litho printers work to, but their actual profile may vary. A good printer will send you an ICC profile and a proof. Use them.

Calibrate the screen you're judging on

You cannot trust an uncalibrated laptop display, especially a glossy one at full brightness in a sunny room. A hardware calibrator (Calibrite, Datacolor Spyder) pays for itself the first time you avoid a reprint. Set a sensible target: around 120 cd/m² brightness, D65 white point, gamma 2.2. Work in a room with neutral light and no window glare on the screen. Then use soft proofing in your design app with the printer's ICC profile to see an approximation of the final result.

This sounds fussy. It isn't. It's the difference between 'that's the colour' and 'that's close enough, I suppose'.

Contrast is a colour decision, not a final check

Accessibility isn't a bolt-on. If the palette's primary colour is a light mint, white text on it will fail. Check body text against WCAG 2.2 AA — 4.5:1 for normal text, 3:1 for large text — using a contrast checker before you fall in love with a layout. Test the palette in greyscale, too. If two colours collapse into the same grey, they can't carry meaning on their own; add a label, an icon or a pattern. And remember that a client's phone in bright sunlight is a contrast test you don't control.

The pre-flight checks before anything leaves the studio

Run this list every time, even when you're in a hurry:

• Confirm the palette's source of truth and that the client has signed it off.
• Convert RGB to CMYK with the correct ICC profile and record the builds.
• Check small black text is 100% K and rich blacks are intentional.
• Keep total ink coverage within the printer's limit — often around 300% for coated, lower for uncoated.
• Turn on overprint preview and check for accidental overprints.
• Confirm spot colours are named correctly and have a physical reference.
• Export as PDF/X-4 with fonts embedded and images at the right resolution.
• Check contrast ratios and greyscale legibility.
• Send the client a screen test: a simple PNG of the palette next to their logo on a neutral background, plus a note that screens vary.
• Ask for a physical proof on the actual stock for anything important.

Hand over the palette, not just the files

A handover folder should include a colour sheet: swatches with hex, RGB, CMYK and Pantone, plus notes on paper stock, contrast rules and what not to do. Add a line saying which values are for screen and which are for print. It takes twenty minutes and saves a dozen emails.

Colour is one of those things everyone thinks they can see. Giving the palette a paper trail — literally — is how you stop the argument before it starts.