At 14:00 the sample looked right. At 20:00, under the room's actual lighting, the warm veining had flattened and the background looked cold. We left it overnight and checked again in the morning.
Move the material, not the argument
The bathroom has a warmer, more controlled light. The slab works there. For the kitchen we chose honed limestone with less contrast and a surface that will be less precious about daily use.
No material was defective. The mistake was approving it somewhere else.