Mortar vs Just Walnut
Where Mortar belongs to Behr's range, Just Walnut is a Dulux color. Mortar reads as grey, while Just Walnut reads as beige-greige — two distinct hue families, not close cousins. Just Walnut (LRV 72) reflects noticeably more light than Mortar (LRV 67), a difference of 5 points that becomes especially apparent in rooms with limited natural light. Mortar runs yellow while Just Walnut is decidedly warm, which means they'll respond very differently to warm vs cool light sources. The ΔE 3.4 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Mortar vs Just Walnut in Real Spaces
1 real room side by side. Mortar and Just Walnut are close enough that the difference can be hard to judge from a chip alone — these photos show how each reads at scale, across different spaces and lighting conditions.
Bathroom
Bathrooms are one of the few spaces where you're genuinely enclosed by the paint color, which makes the choice between these two more consequential. Just Walnut reads slightly lighter here — a subtle but real difference in how open the space feels.
Color Details
Mortar vs Just Walnut Simulated Comparison
5 simulated room previews — drag the slider on each to see Mortar on one side and Just Walnut 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 Mortar comparisons
See how Mortar stacks up against other well-photographed colors across different brands and tones.
