Plot Black sets the weight of the palette in authority and sophistication, and Dimension Line is the swatch that breaks rank: a single charcoal that stops the set reading as one note. Plot Black to Vellum White spans 93 points of lightness, so the palette can carry its own hierarchy without reaching for a second one. Saturation averages 0 percent, so close to grey that Plot Black reads as a colour accent purely by being the least grey thing present.
Plot Black reads as pure authority: sophistication, power, and the visual weight that makes everything placed near it feel more serious.
Dimension Line is black's softer relative, still authoritative, but with enough warmth to feel considered rather than severe.
Object Grey is true neutrality, balance and restraint, a color that recedes so the palette's other choices can carry the emotional weight.
Pale Rule functions as quiet breathing room, understated, unobtrusive, built to let other colors do the talking.
Vellum White reads as purity and openness, the color of empty space, clarity, and things left deliberately unresolved.
Technical drawings on blue with white lines showing plans and schematics
Explore the full Blueprint style guideIts decade on the timeline · 1840s