Polished Bone vs Bone White

How close are they?

ΔE 6.0, close: similar, with a visible difference side by side. Bone White is a little darker, more saturated, warmer than Polished Bone.

Can I use Bone White instead of Polished Bone?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Bone White is a little darker, more saturated, warmer than Polished Bone.

Can I use Polished Bone instead of Bone White?

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

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.