Colour Guides
Short, practical guides on working with colour — theory, accessibility, and the formats you'll encounter every day.
Colour Theory Basics
Hue, saturation, and value; warm and cool; the classic harmonies and how to turn a base colour into a palette.
Colour Accessibility
WCAG contrast ratios, colour-vision deficiency, and a checklist for palettes that work for more people.
HEX, RGB, HSL & CMYK
What each colour model means, when to use it, and why CMYK can't be trusted from RGB alone.