RAL 640-M vs Frank Blue
RAL 640-M is a RAL Effect color while Frank Blue comes from Sherwin-Williams. Both sit in the blue family, which is useful context if you're narrowing within a single hue direction. At LRV 8 vs 5, Frank Blue will read as the brighter of the two — a 3-point gap that matters most in north-facing or low-light rooms. At ΔE 3.5, the difference is perceptible but not dramatic — the two can work harmoniously in the same space. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
RAL 640-M vs Frank Blue in Real Spaces
2 real rooms side by side. RAL 640-M and Frank Blue 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 amplify color — the enclosed space and reflective surfaces make what reads subtle elsewhere feel more present here. Side by side like this, the difference is easy to read — which is exactly why seeing them in a real space is more useful than comparing chips.
Kitchen Cabinets
On cabinetry, undertone and temperature become more pronounced against countertops and hardware. Side by side like this, the difference is easy to read — which is exactly why seeing them in a real space is more useful than comparing chips.
Color Details
RAL 640-M vs Frank Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 640-M on one side and Frank 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 RAL 640-M comparisons
See how RAL 640-M stacks up against other well-photographed colors across different brands and tones.
