That gray paint chip looked fine at the store and turned blue on the wall, 4 coats later
Warning to anyone picking neutrals for a north-facing room: that swatch under the store's warm lights lied to me, and repainting a hallway in Denver took 3 weekends, not the one afternoon I planned. Check your chip on the actual wall at night before you buy a gallon, has anyone else been burned by a warm-lit paint aisle?