Prussian Blue

See this colour in the real world

Colours in photographs vary with lighting, material, camera processing and screen calibration — the named colours below are visual approximations, not exact measurements.

Colour stories

Why Prussian blue mattered for affordable colour

Before Prussian blue's accidental discovery around 1706, a strong, stable blue meant paying for natural ultramarine's enormous cost — Prussian blue was significantly cheaper to produce and is widely credited as the first modern synthetic pigment, genuinely changing what a working painter (not just a wealthy patron) could afford to use.

In practice: Prussian blue's affordability is a real, documented milestone in the much longer story of colour becoming cheaper and more widely available — a trend that continued through the 19th-century synthetic-dye boom.

See prussian blueImage credit

Used in historical palettes

Prussian Blue appears in the following curated historical/cultural palettes.

Uses & contexts

Using prussian blue in a real space

Worked out from this colour’s own measurements — its lightness, saturation and undertone — rather than written for it. That is why the guidance differs from one colour to the next even when the two look similar.

What role it can play

This works across a range of sizes. At chroma 25 it is assertive enough to register on a small object and restrained enough not to dominate a wall.

• Walls and large surfaces

  strong

  Chroma 25 sits inside the range walls and large surfaces carry without taking over the room. At L*19 it also absorbs a good deal of the light in the room, so plan the lighting alongside it rather than afterwards.

• Secondary surfaces

  strong

  Chroma 25 sits inside the range secondary surfaces carry without taking over the room.

• Furniture

  strong

  Chroma 25 sits inside the range furniture carry without taking over the room.

• Rugs, curtains and bedding

  strong

  Chroma 25 sits inside the range rugs, curtains and bedding carry without taking over the room.

• Trim and joinery

  strong

  Chroma 25 sits inside the range trim and joinery carry without taking over the room.

• Accents and small objects

  strong

  Chroma 25 is exactly what an accent is for. The saturation that makes this difficult across a wall is the reason it works on a cushion, a door or a single chair.

How it behaves under different lightmoderate

Under warm bulbs

Warm bulbs emit little short-wavelength energy, so there is less for a blue to reflect. There is enough chroma here to survive it, though it will read warmer and slightly duller.

Under cool bulbs

Cool light flatters this — it will hold its identity and may read slightly more saturated than in warm light.

In daylight

Deep colours hold their identity in daylight better than pale ones, because there is more of the range left to work in. This will look most like itself in good indirect light.

In a dim room

At low light levels the eye's colour discrimination genuinely falls and deep colours converge toward each other. This will read as "dark" rather than as its own colour in a dim room unless it is lit.

Compared with the sample card

Already deep, so there is little further to fall — but on a large matte surface it will absorb enough light to look flatter than the sample.

What colour temperature actually means · Why two bulbs at the same rating can differ

With wood

• Oak

  works well

  Opposite in undertone to Oak, and separated enough in hue that the difference reads as deliberate contrast rather than as a clash. The amount of timber matters as much as the tone: one piece is an accent, a floor plus joinery is the room's dominant colour.

• Walnut

  works well

  Opposite in undertone to Walnut, and separated enough in hue that the difference reads as deliberate contrast rather than as a clash. The amount of timber matters as much as the tone: one piece is an accent, a floor plus joinery is the room's dominant colour.

• Pine

  works well

  Opposite in undertone to Pine, and separated enough in hue that the difference reads as deliberate contrast rather than as a clash. The amount of timber matters as much as the tone: one piece is an accent, a floor plus joinery is the room's dominant colour.

• Plywood

  works well

  Opposite in undertone to Plywood, and separated enough in hue that the difference reads as deliberate contrast rather than as a clash. The amount of timber matters as much as the tone: one piece is an accent, a floor plus joinery is the room's dominant colour.

• Light wood (ash, birch, beech)

  works well

  Opposite in undertone to Light wood (ash, birch, beech), and separated enough in hue that the difference reads as deliberate contrast rather than as a clash. The amount of timber matters as much as the tone: one piece is an accent, a floor plus joinery is the room's dominant colour.

• Dark wood

  works well

  Opposite in undertone to Dark wood, and separated enough in hue that the difference reads as deliberate contrast rather than as a clash. The amount of timber matters as much as the tone: one piece is an accent, a floor plus joinery is the room's dominant colour.

• Reddish wood (mahogany, cherry, teak)

  works well

  Opposite in undertone to Reddish wood (mahogany, cherry, teak), and separated enough in hue that the difference reads as deliberate contrast rather than as a clash. The amount of timber matters as much as the tone: one piece is an accent, a floor plus joinery is the room's dominant colour.

With metal fittings

• Brass

  works well

  Shares Brass's cool bias, so the two agree about the temperature of the room. There is also 48 points of lightness between them, which keeps the two readable as separate elements. Metal carries more attention than its area suggests, so repetition matters more than the exact finish.

• Gold-tone

  works well

  Shares Gold-tone's cool bias, so the two agree about the temperature of the room. There is also 48 points of lightness between them, which keeps the two readable as separate elements. Metal carries more attention than its area suggests, so repetition matters more than the exact finish.

• Chrome

  works well

  Shares Chrome's cool bias, so the two agree about the temperature of the room. There is also 61 points of lightness between them, which keeps the two readable as separate elements. Metal carries more attention than its area suggests, so repetition matters more than the exact finish.

• Stainless steel

  works well

  Shares Stainless steel's cool bias, so the two agree about the temperature of the room. There is also 57 points of lightness between them, which keeps the two readable as separate elements. Metal carries more attention than its area suggests, so repetition matters more than the exact finish.

• Black metal

  needs care

  This sits close to Black metal without matching it — near enough that the eye reads an attempted match and far enough that it fails. Either move decisively away or repeat the tone exactly.

• Copper

  works well

  Shares Copper's cool bias, so the two agree about the temperature of the room. There is also 48 points of lightness between them, which keeps the two readable as separate elements. Metal carries more attention than its area suggests, so repetition matters more than the exact finish.

Where it can go wrong

• May read as simply dark rather than as its own colour. Below about L*22 the eye stops distinguishing hue reliably in ordinary room light, so this needs good lighting to be seen as anything but black.

Lighter, darker & directional variants

Calculated directional adjustments. Some directions converge on the same result from this starting colour — shown as one merged card with an explanation, not repeated duplicates. Generated shades link to a curated profile only when one is close enough.