Imperial Red vs Blood Chalice

How close are they?

ΔE 8.4, close: similar, with a visible difference side by side. Blood Chalice is a little darker, more muted than Imperial Red.

Can I use Blood Chalice instead of Imperial Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Blood Chalice is a little darker, more muted than Imperial Red.

Can I use Imperial Red instead of Blood Chalice?

The same difference applies the other way round: Imperial Red is a little lighter, more saturated.

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.