Comparison

Shale vs Purbeck Stone

Benjamin Moore 861 and Farrow & Ball 275, ΔE 1.83 apart

Benjamin Moore Shale 861 on a wall, hex #C3BDB1
Shale Benjamin Moore 861
Farrow & Ball Purbeck Stone 275 on a wall, hex #C0BCB3
Purbeck Stone Farrow & Ball 275
Zeytin’s verdict · ΔE 1.83Twins, almost. Only daylight on a big wall tells them apart.

Benjamin Moore Shale (861) and Farrow & Ball Purbeck Stone (275) measure a delta-E of 1.83 apart. They sit within 0.1 LRV points of each other, so neither will look brighter than the other on the same wall. Both carry a similar amount of color, at chroma 6.8 and 5. The difference is measurable but subtle. It shows on a large wall in strong daylight and disappears under lamplight. If you need the Purbeck Stone depth in Benjamin Moore's line, start from its LRV of 50.4 rather than matching by name.

Is Benjamin Moore Shale the same color as Farrow & Ball Purbeck Stone?

Not quite, but close - Benjamin Moore Shale and Farrow & Ball Purbeck Stone are delta-E 1.83 apart, close enough that most rooms would not show the difference.

What is the delta-E between Benjamin Moore Shale and Farrow & Ball Purbeck Stone?

The measured color distance between Benjamin Moore Shale and Farrow & Ball Purbeck Stone is delta-E 1.83.

CLOSEST PAIRΔE 1.83 Shale and Purbeck Stone
LIGHTESTShale LRV 50.5
DARKESTPurbeck Stone LRV 50.4
SPREAD0.1LRV points

Side by side

measured values
Shale Purbeck Stone
Brand Benjamin Moore Farrow & Ball
Code 861 275
Hex #C3BDB1 #C0BCB3
Light reflectance 50.5 50.4
Undertone yellow cast yellow cast
Chroma 6.8 5.0
Hue angle 89.9° 92.3°
Color family gray gray

Each on its own

full detail