Necron Compound vs Obsidian Black

How close are they?

ΔE 10.9, fair: the same colour family, but not a straight swap. Obsidian Black is a little lighter, more muted than Necron Compound.

Can I use Obsidian Black instead of Necron Compound?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Obsidian Black is a little lighter, more muted than Necron Compound.

Can I use Necron Compound instead of Obsidian Black?

The same difference applies the other way round: Necron Compound is a little darker, more saturated.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.