Celtic Forest 3 vs Grey Blue
Celtic Forest 3 (Dulux) and Grey Blue (RAL Classic) come from different manufacturers. Hue-wise, Celtic Forest 3 belongs to the beige-greige family and Grey Blue to the blue-grey family. The 45-point LRV gap — 52 for Celtic Forest 3 vs 7 for Grey Blue — means Celtic Forest 3 will open up a space more effectively. A ΔE of 49.4 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Celtic Forest 3 vs Grey Blue in Real Spaces
2 real rooms side by side. Seeing Celtic Forest 3 and Grey Blue in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Bedroom
Bedrooms are typically lit with warmer, lower light than the rest of the house — a condition that flatters warm tones and deepens cool ones. Celtic Forest 3 returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Front Door
On a front door, the color is both the first and last thing you see — a context where even a modest tonal difference reads clearly. Celtic Forest 3 reflects noticeably more light off the walls, making the space read more open than Grey Blue.
Color Details
Celtic Forest 3 vs Grey Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see Celtic Forest 3 on one side and Grey Blue 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 Celtic Forest 3 comparisons
See how Celtic Forest 3 stacks up against other well-photographed colors across different brands and tones.
