Don't forget that black, white, and grey are your friends. They act as "breathing room" between the four vibrant hues. Conclusion
| Do This | Avoid This | |--------|------------| | Choose (60% of area) | Equal area for all four colors | | Use one or two colors as accents (10% each) | All four at 100% saturation | | Break the fourth color into a tiny detail (button, underline) | Using tetradic for body text or dense UI | | Test in grayscale first – if no contrast hierarchy, it fails | Assuming “color wheel says it’s harmonious” – the wheel lies without value control | tetradic colours