Carnelian Skin vs Purple Shadow

How close are they?

ΔE 9.2, close: similar, with a visible difference side by side. Purple Shadow is more saturated, cooler than Carnelian Skin.

Can I use Purple Shadow instead of Carnelian Skin?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Purple Shadow is more saturated, cooler than Carnelian Skin.

Can I use Carnelian Skin instead of Purple Shadow?

The same difference applies the other way round: Carnelian Skin is 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.