Color systems in 1905: Shared baseline

In reports, ads and assignments it fits legends, brand systems, accessible data color. Skip it when rainbow defaults, or encoding two quantities in one hue. This page gathers anatomy, fit, craft, failure modes and work / ads / school recipes for Color systems. When the story is: legends, brand systems, accessible data color.

Skip it in cases like: rainbow defaults, or encoding two quantities in one hue. Munsell 1905; Brewer palettes (1994–) for maps; OKLCH in modern CSS hue, value and chroma mapped to category or magnitude Yes if one claim is visible at a glance in Meta, Google and retail print; otherwise link to a full figure.

Yes for lab reports and poster boards if axes, units and a source line are present. Excel or Google Sheets or PowerPoint; export SVG/PDF. Do not rely on hue alone. Label directly and check greyscale. Color systems: honour hue, value and chroma mapped to category or magnitude, and switch when rainbow defaults, or encoding two quantities in one hue.