Acier
Sherwin-Williams · SW9170
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The Analysis
Acier is a mid-tone grey that brings a grounded, stable feel to a room. With an LRV of 32.1, it absorbs a fair amount of light, which helps define larger spaces and prevents them from feeling empty, though it may make smaller, dimly lit rooms feel a bit more enclosed.
This is an ideal 'workhorse' neutral for main living areas or hallways where you want a sophisticated foundation. It functions best as a whole-room colour, providing enough depth to make white trim and architectural details pop.
LRV 32History & Origin
Acier fits firmly into the modern, clean-lined aesthetic of the last two decades. It lacks the ornate qualities of historical palettes, making it a perfect choice for contemporary homes looking for a timeless, professional finish.
How to Use It
It pairs beautifully with warm wood tones like walnut to balance its coolness, and matte black hardware for a high-contrast, modern look. Use this in rooms with plenty of natural light to prevent it from feeling too heavy or grey.
The Mood
Living with Acier feels restful and composed. Because it lacks aggressive blue or yellow undertones, it provides a neutral, steady backdrop that keeps a room feeling orderly rather than stimulating or chaotic.
Colour harmonies
Complementary
Opposite on the colour wheel — bold, high-contrast pairings. Use for a feature wall or furniture you want to command attention.
Analogous
Neighbouring hues — cohesive and calm, great for layered schemes that feel collected rather than matched.
Split complementary
Near-opposites for strong contrast with a little less tension than a pure complement. A favourite of interior designers.
Triadic
Three evenly spaced hues — balanced, vibrant, and versatile. Keep one dominant and use the others sparingly.
Tetradic (square)
Four hues in a square on the wheel — rich, dynamic palettes. Best when one colour leads and the others accent.
Monochromatic
Dark, mid, and light steps on the same hue — a failsafe gradient for trim, walls, and accents without shifting colour family.
Add harmony palette to a room
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Brand Matches
Perceptually similar colours from across all brands in our database.
Lighting
See how this colour shifts across natural and artificial light conditions.
- Natural