Code BLACK (Black) reflects 5% of incident D65 light. Measured in CAM16-UCS uniform space, Behr Black (BLACK) registers J'=28.8, a'=-0.71, and b'=0.52 with HSL (60°, 1%, 25%) and Helmholtz-Kohlrausch perceived value 26.7 L*_HK. Because BLACK carries a*=-0.22 red-green and b*=0.61 yellow-blue balance at chroma C*=0.65, Black projects a neutral crisp neutral true white/grey character across drywall and millwork.
Thermal lighting shifts Behr BLACK predictably. Under 5000K noon daylight, Black (BLACK) holds its native #423F3B swatch; at 4000K cool office LED, BLACK adapts to #443E38; at 3500K halogen, Black transitions to #463E36; at 3000K residential LED, BLACK warms to #483D34; and under 2700K evening bulbs, Black (BLACK) settles at #493D33.
When cross-matching Behr Black (BLACK, #3F3F3E), Benjamin Moore Black Jack (2133-20, #3D3D3E, LRV 4.68%) scores ΔE2000=1.51 and CAM16=2.04, followed by Black Panther (2125-10, ΔE=1.59). In Sherwin-Williams, Iron Ore (SW 7069, #434341, LRV 5.59%) achieves ΔE2000=1.45 ahead of Greenblack (SW 6994, ΔE=2.57). Coordinate BLACK with Ultra Pure White® (UPW) ceilings, Silver Chalice (640E-1) trim, Falcon Gray (PPU26-04) hallways, and Rock Crystal (MQ3-28) accents.