Mid-key values give Jacoba van Heemskerck its characteristic quietness - nothing blazes, nothing disappears. Jacoba van Heemskerck tilts toward cool - blues and silver-greys carry the structural weight. Mid-saturation across the board: the palette has colour character without chromatic excess. 31.7% of the palette belongs to #1A1420, a concentration that makes it the unmistakable visual centre. The saturated accent, #1433BD, registers at 3.1% - sparse enough to feel like a deliberate surprise. At 70 units of value range, the palette has the tonal breadth to sustain complex spatial readings. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. In the context of Jacoba van Heemskerck's full range of palettes, group 6 represents one movement in an ongoing chromatic dialogue.