RAL 840-3
Warm Stone Grey
RAL 840-3 Warm Stone Grey is a mid-tone warm grey with earthy, stone-like undertones from the RAL Effect 840 group. This versatile shade evokes natural limestone and weathered concrete, making it well suited for exterior cladding, landscape architecture, and natural-themed design. It blends seamlessly with natural materials.
Color Reference
RAL Effect colors combine a base shade with a metallic or pearl variant. Base shades (-1 through -6) offer tonal gradation within a color family. The -M suffix indicates a metallic finish with shimmer and depth for architectural and automotive applications.
WCAG 2.1 AA requires 4.5:1 contrast for normal text. Results show this color as a background.
Spectrum & Perceptual Position
CIELAB is a perceptually uniform color space. Euclidean distance between two colors in this diagram closely matches human visual difference. The dot size shows your selected color; slightly larger dots are the nearest perceptual neighbors.
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Reference + opposite hue with tonal variations
Contrast ratios follow WCAG 2.1 guidelines. Green (≥4.5:1) passes AA for normal text. Amber (≥3:1) passes for large text only. Grey indicates low contrast.
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