Your tile decides how warm to go. Bright white subway tile is cool, so pick the warmest gray on your list, like Agreeable Gray (SW 7029) or Revere Pewter (HC-172), to balance it. Marble tile already has warm cream and tan veining, so a lighter pick like Classic Gray (OC-23) or Repose Gray (SW 7015) sits beside it without fighting. For metal, chrome and matte black are neutral and work with any of these grays. Brass and gold are warm, so they look best with greige walls. A quick rule: cool tile wants a warmer wall, warm tile lets you go lighter and softer.
Bulbs matter as much as paint. Look at the box for the Kelvin number. Anything labeled 4000K or higher is cool and blue, and it will drag your gray cold. Choose warm white bulbs around 2700K instead. They give a soft, slightly golden light that protects the warmth in your gray. Use the same bulb in the vanity and the ceiling so the color stays even. Test by holding a chip near the mirror at night with your real bulbs on, not just in daytime window light. If the gray still looks blue under 2700K, step up to a warmer greige like Revere Pewter (HC-172).
The biggest mistake is judging the color in the store or in daylight, then hating it at night. Always tape a big sample to the wall and watch it morning, noon, and evening with your own lights. Another mistake is flat paint in a wet room. Bathrooms get steam and splashes, so flat finishes stain and grow mildew. Use satin or semi-gloss so walls wipe clean and shrug off moisture. Do not pick the coolest gray you see online because screens hide undertones. And do not skip a real undertone test, covered in the FAQ below, before you buy a gallon.
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