Necrolith Bone vs Ivory

How close are they?

ΔE 7.6, close: similar, with a visible difference side by side. Ivory is a little darker, more saturated, cooler than Necrolith Bone.

Can I use Ivory instead of Necrolith Bone?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Ivory is a little darker, more saturated, cooler than Necrolith Bone.

Can I use Necrolith Bone instead of Ivory?

The same difference applies the other way round: Necrolith Bone is a little lighter, more muted, warmer.

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.