If you have high ceilings another example of this two tone technique might be to pair a bright coral with tan this time reversing the theme of light above dark.
Two tone room colors with chair rail.
Layout figure out whether the colors are going to be separated per wall or if they are going to be separated by a horizontal chair rail or wainscoting.
When neighboring color wheel hues share the same undertone such as greenish blue gray and sage green two tone walls display a gentle transition without a chair rail partition.
When you have a chair rail it can be hard to figure out whether to use the same paint colour on the upper and lower portion of the walls or to do two different colours.
By putting the bolder color above the molding above the chair.
These are two different colors but work well together without allowing the bright hue of pink to overpower the room.
The fourth bedroom has a chair rail with wainscoting under it.
When updating the room for my oldest son we painted above the chair rail a gray and painting white below the chair rail.
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Older homes with chair rails ballpark 1960 s and earlier if you have an older home you should be able to pull off a two colour or two tone palette.