M9.21.31
Dulux
Try 1384616 on your wall
Take a photo of the room. Muro puts this color on the walls in the light the room actually has.
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How M9.21.31 behaves on a wall
Dulux publishes a light reflectance value of 34.7 for this shade. At LRV 34.7 this sits mid-scale — dark enough to hold its own against white trim, light enough not to close a room in. Mid-tones shift the most between daylight and lamplight, so check it at both ends of the day. For trim that reads as a clear edge rather than a smudge, aim about 30 LRV points away in either direction — under LRV 5 or over LRV 65. With 37 points between its strongest and weakest channel it holds a readable green cast, so it will not flatten into a neutral once it is on four walls. Order by the code, not the name, and put a test patch on the wall before you commit — a screen cannot show you how this shade behaves in your own light.
M9.21.31 equivalents in other paint brands
The closest color to Dulux M9.21.31 from each brand we carry, measured with CIEDE2000 on the manufacturers' published color values. Below 1 the difference is practically invisible; below 2 you'd only notice it with the chips side by side. Screens and printed chips aren't paint, so compare real samples before you buy. In the Muro app you can put two of them on a photo of your own wall and look at them in your light.