Data viz
Charts read like the rest of the system — neutral by default, with one warm highlight where the story is. Graphite carries the leading series, Baltic supports, Steel sits behind. High Voltage flags the moment that matters; Prussian carries soft target bands and second-tier callouts.
Six roles, one ordering
Every chart picks colors in this order. If the chart needs a fourth series, drop to a lighter Baltic or Steel step before reaching for a new hue.
Comparison & ranking
For ranked comparisons, set every bar in Graphite and recolor the one that carries the headline in High Voltage. Avoid rainbow categorical bars.
Altris Energy Cell vs. industry benchmarks
Wh/kg, third-party verified. Highest result in High Voltage; the rest in Graphite.
Trend over time
Time-series in Graphite (primary), Baltic (secondary), Steel (tertiary, dashed). A Prussian band shows the operational target range; one High Voltage point flags the result we want the eye to land on.
Capacity at 25°C across 4,000 cycles
Three chemistries on the same cycler. Prussian band = 80% retention target. High Voltage = Altris at end-of-test.
Composition
Donut, never a full pie. Slices step through the series order; the largest or most strategic slice can take the High Voltage hit when it carries the headline.
Where Altris cell materials come from
European share is the headline — High Voltage. All other slices in the neutral ramp.
Where the cost lives
No single value is the headline — neutral-only donut. Use this when no slice deserves emphasis.
Big numbers
For decks and datasheets — one big figure, units in Light, optional High Voltage delta. Never more than one accent per row.
Six rules for charts
Same logic as the rest of color: neutrals first, accents earn their place.
One accent per chart
Either High Voltage or Prussian — not both. The other series sit in the neutral ramp.
Series order is fixed
Graphite → Baltic → Steel. If you need more series, drop to lighter steps before reaching for new hues.
Mist for grid, never data
Use Mist (#DDDDDD) for axes and gridlines. Never as a series color — it disappears.
Donut, not pie
Always leave the centre open — put the headline figure or unit there. Slices read better, ink reads less decorative.
Prussian for bands
Target ranges, confidence intervals, "good enough" zones — Prussian at low opacity. Never as a series.
Mono for numerals
Axis ticks, legend percentages, data labels — JetBrains Mono. Headline numbers stay in Axia Black.