Choosing brand colours is a question of function, not of mood: a good palette consists of five clearly defined roles whose combinations meet the accessibility (WCAG) contrast values and set you apart in the market. Meet those criteria and you can justify the decision without a colour psychology debate.
Below: what colour psychology actually delivers, how to define the five roles of a palette, which contrast values apply and how to stand out without losing credibility, including a checklist.
Why colour psychology alone is not enough
The claim that "blue feels trustworthy, red is exciting" is often quoted. But the effects measured in studies are small, strongly context-dependent and culturally shaped, the same colour can mean different things in different cultures. Basing a decision on colour psychology alone builds on shaky ground.
Three criteria are measurable and checkable:
- Function: does the colour have a clear job in the palette?
- Contrast: do the combinations meet the WCAG minimums for text?
- Differentiation: does the overall look stand out in the market without losing credibility?
Colour psychology can give impulses; it is not a basis for decisions.
Which five roles does a colour system have?
Instead of "one brand colour", define five roles:
| Role | Job | Use |
|---|---|---|
| Primary colour | Dominant brand presence, recognition | Logo, hero areas, main CTAs |
| Accent colour | Highlights actions and key moments | Buttons, links, graphic accents |
| Neutrals (2) | Text and surfaces | Text, backgrounds, dividers, cards |
| Signal / function colour | Status, success, warning, error | Forms, notifications, status markers |
Each role has exactly one job; using one colour for several purposes breaks the system. The neutrals are often the hardest part: too little contrast makes text hard to read, too much grey feels sterile. Two neutrals (dark for text, light for surfaces) are a safe default.
Which contrast values must brand colours meet?
Contrast is a measurable part of accessibility. Under WCAG 2.1 (level AA):
- Normal text (smaller than 18 pt / 14 pt bold): a minimum contrast ratio of 4.5:1 against the background.
- Large text (from 18 pt / 14 pt bold): a minimum of 3:1.
- UI components (buttons, inputs, icons): a minimum of 3:1 against surrounding elements.
In practice this means: check every combination in your palette, primary on white, accent on a dark surface, text colour on the neutrals, before sign-off. Free contrast checkers such as the one from WebAIM do the job in seconds. A common mistake: a colour that works beautifully as a logo fails as a text colour. Test every colour in the role it will actually be used in.
How do you stand out without losing credibility?
In many industries similar palettes dominate, law and finance on dark blue and grey, healthcare on green and blue. That is expectation, not a mistake. Differentiation does not come from breaking with the industry, but from the one moment where you look different: an unusual accent colour that hardly anyone in your industry uses.
The deviation must fit the tone of the brand. A law firm positioned as "clear, direct, modern" can stand out with a warm accent colour; a "steady, conservative" one loses credibility with the same move. A colour that is interesting in isolation can also feel overloaded together with logo, typography and imagery. So build a simple landing page or social media template with the palette and look at it for a few days.
Checklist: how to choose your brand colours
- Positioning in one sentence (what, for whom, why us)
- Five roles defined: primary, accent, two neutrals, signal colour
- Every role has one documented job
- All text-on-background combinations checked against WCAG 2.1 (4.5:1 / 3:1)
- Palette compared against the market: at least one deliberate moment of deviation
- The deviation fits the tone of the positioning
- Overall look tested in a simple template
- Colour values (HEX, RGB, Pantone) documented for print and digital
If an item is missing, start there. How the colours grow into a complete visual system is explained in What is a corporate design?; the view on the whole brand is in What is a brand identity?. Our offer is on the Branding page.
Conclusion
Choosing brand colours is not an art project but a systems project: five roles, clear contrast values, one deliberate moment of differentiation. The result is a palette that works across website, print and social media.
Unsure whether your current palette meets these criteria? Talk to us: we will check together what is missing and where the next step lies.
Sources
- W3C: Web Content Accessibility Guidelines (WCAG) 2.1
- WebAIM: Contrast Checker
- Wikipedia: Color psychology
