Putrid Green vs Ushabti Bone

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Ushabti Bone is more muted, warmer than Putrid Green.

Can I use Ushabti Bone instead of Putrid Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Ushabti Bone is more muted, warmer than Putrid Green.

Can I use Putrid Green instead of Ushabti Bone?

The same difference applies the other way round: Putrid Green is more saturated, 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.