Dark Violet vs Evil Red

How close are they?

ΔE 8.0, close: similar, with a visible difference side by side. Evil Red is more muted, cooler than Dark Violet.

Can I use Evil Red instead of Dark Violet?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Evil Red is more muted, cooler than Dark Violet.

Can I use Dark Violet instead of Evil Red?

The same difference applies the other way round: Dark Violet is more saturated, 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.