Cook's Blue vs Sky blue
Where Cook's Blue belongs to Farrow & Ball's range, Sky blue is a RAL Classic color. Both sit in the blue family, which is useful context if you're narrowing within a single hue direction. Cook's Blue (LRV 25) reflects noticeably more light than Sky blue (LRV 19), a difference of 6 points that becomes especially apparent in rooms with limited natural light. With a ΔE of 16.5, 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.
Cook's Blue vs Sky blue in Real Spaces
2 real rooms side by side. Seeing Cook's Blue and Sky blue in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
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. Cook's Blue reads slightly lighter here — a subtle but real difference in how open the space feels.
Front Door
A front door is a focal point — small color differences read clearly at this concentrated scale. The brightness difference is modest but present — Cook's Blue gives the walls a little more lift.
Color Details
Cook's Blue vs Sky blue Simulated Comparison
5 simulated room previews — drag the slider on each to see Cook's Blue on one side and Sky 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 Cook's Blue comparisons
See how Cook's Blue stacks up against other well-photographed colors across different brands and tones.
