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You picked a white. It looked clean and calm on the chip, slightly warm, exactly the thing. Two coats later the room reads faintly green in the afternoon, the trim looks dirty next to it, and you cannot say why. Nothing is wrong with the paint. The problem is that you chose it in the wrong place, from the wrong size of sample, without looking at what else is in the room.

White is never white

Every white paint is a white base with a small quantity of tint in it, and that tint is what you are actually choosing. It might be yellow, it might be red, it might be black and blue together. On a two-inch chip under a store’s neutral lighting, that tint is almost invisible. Across a twelve-foot wall reflecting light back and forth, it becomes the dominant characteristic of the room.

This is the whole of the undertone problem. A white with a yellow tint in a room with a lawn outside will read green, because the light coming through the window is already green before it hits your wall. A white with a violet tint on a north elevation will read gray and cold, because north light has no warmth in it to counteract the blue.

The three mistakes

Nearly every paint disappointment we are called in to fix comes down to one of three things.

• Choosing from a chip. A chip is roughly one nine-hundredth of the area of a wall. Color intensity compounds with area, and a chip simply cannot show you what will happen.
• Testing on one wall. Every wall in a room receives different light. A sample that looks right on the window wall can look muddy on the wall opposite it, which is the one you are usually facing.
• Ignoring the fixed materials. The floor, the counter, the fireplace and the large rug are not changing. They are throwing color back at the wall all day, and the wall has to survive that.

What to do instead

Buy sample pots, not chips, and paint at least two feet square on at least two walls per room. Put a second coat on. Wait until it is properly dry, because most paints shift as they cure, and then leave it alone for several days.

Look at each sample four times:

1. Early morning, when north-facing rooms are at their coolest and bluest.
2. Around midday, with whatever reflected light your yard, street or neighbor’s wall is contributing.
3. Late afternoon, when west light turns everything orange for about forty minutes.
4. At night, under your actual lamps at their actual color temperature.

If a sample survives all four, it will survive the room.

Trim is half the decision

The most common visible failure is not the wall at all. It is a wall white and a trim white with different undertones sitting directly against each other, where the eye can compare them at a joint. One will look correct and the other will look slightly soiled, and the effect is unmistakable once you have seen it.

The safe approach is to take the trim from the same family as the wall, either the same color at a higher sheen or a lighter tint of it. The riskier approach, which can be excellent, is a deliberate contrast, but that only works if both colors share an undertone.

Three colors used across a whole house will always look more considered than twelve colors used bravely in one room. Restraint is not timidity here. It is the mechanism.

Sheen matters more than people expect

Sheen changes perceived color. The same paint in a flat finish and a satin finish will not read as the same color, because the satin is reflecting the light source and the flat is scattering it. As a rule: flat or matte on ceilings and on any wall with imperfections, eggshell on walls that get touched, satin or semi-gloss on trim and doors.

And the bit nobody enjoys

Preparation decides how the color looks at least as much as the paint does. A wall with patched repairs will show every patch through a flat finish in raking light. If the surface is poor, either fix it properly or choose a finish and a color that forgive it, and be honest with yourself about which one you are doing.

Get the undertone right, test it properly, and resolve the trim at the same time as the wall. Do those three things and you will not need to repaint in a year.