Blood Red vs Evil Sunz Scarlet

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Evil Sunz Scarlet is a little darker than Blood Red.

Can I use Evil Sunz Scarlet instead of Blood Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Evil Sunz Scarlet is a little darker than Blood Red.

Can I use Blood Red instead of Evil Sunz Scarlet?

The same difference applies the other way round: Blood Red is a little lighter.

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.