Cook's Blue vs RAL 610-M
Where Cook's Blue belongs to Farrow & Ball's range, RAL 610-M is a RAL Effect color. These are both blues, so the question isn't which hue to choose — it's where within blue to land. RAL 610-M (LRV 29) reflects noticeably more light than Cook's Blue (LRV 25), a difference of 3 points that becomes especially apparent in rooms with limited natural light. The ΔE 4.8 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 5 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Cook's Blue vs RAL 610-M in Real Spaces
5 real rooms side by side. Cook's Blue and RAL 610-M 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.
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 brightness difference is modest but present — RAL 610-M gives the walls a little more lift.
Bedroom
The context that matters most in a bedroom is how a color reads under a bedside lamp at night, not under noon daylight. RAL 610-M reads slightly lighter here — a subtle but real difference in how open the space feels.
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. RAL 610-M reads slightly lighter here — a subtle but real difference in how open the space feels.
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. RAL 610-M reads slightly lighter here — a subtle but real difference in how open the space feels.
Kitchen Cabinets
Kitchen cabinets are constantly compared against adjacent materials, which means subtle differences between these two become much more visible. RAL 610-M reads slightly lighter here — a subtle but real difference in how open the space feels.
Color Details
Cook's Blue vs RAL 610-M Simulated Comparison
5 simulated room previews — drag the slider on each to see Cook's Blue on one side and RAL 610-M 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 Cook's Blue comparisons
See how Cook's Blue stacks up against other well-photographed colors across different brands and tones.
