Warm Onyx vs Treron
Where Warm Onyx belongs to Behr's range, Treron is a Farrow & Ball color. Hue-wise, Warm Onyx belongs to the grey family and Treron to the greige-grey family. Treron (LRV 25) reflects noticeably more light than Warm Onyx (LRV 7), a difference of 18 points that becomes especially apparent in rooms with limited natural light. Warm Onyx runs red while Treron is decidedly warm, which means they'll respond very differently to warm vs cool light sources. With a ΔE of 27.7, the contrast is hard to miss. These aren't variations on a theme — they're two different answers to the same question. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Warm Onyx vs Treron in Real Spaces
2 real rooms side by side. Seeing Warm Onyx and Treron in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Living Room
In a living room, color works across both daylight and evening light — the same wall can read very differently at noon and at 8pm. The LRV gap is large enough that Treron will make the room feel meaningfully brighter than Warm Onyx would.
House
Seen across an entire facade, subtle tonal differences become pronounced. What reads as nearly the same on a chip often reads as clearly different at scale. Treron reflects noticeably more light off the walls, making the space read more open than Warm Onyx.
Color Details
Warm Onyx vs Treron Simulated Comparison
5 simulated room previews — drag the slider on each to see Warm Onyx on one side and Treron on the other.
Digital color is approximate. These simulations are generated from the manufacturer's hex values and overlaid on grayscale room photos — your screen's calibration, brightness, and viewing angle all affect how they render. Before committing to either color, test physical samples in your own space under the light you actually live with.
More Warm Onyx comparisons
See how Warm Onyx stacks up against other well-photographed colors across different brands and tones.
