Resplendent Red vs Quinacridone Burnt Orange

How close are they?

ΔE 9.4, close: similar, with a visible difference side by side. Quinacridone Burnt Orange is a little darker, more muted than Resplendent Red.

Can I use Quinacridone Burnt Orange instead of Resplendent Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Quinacridone Burnt Orange is a little darker, more muted than Resplendent Red.

Can I use Resplendent Red instead of Quinacridone Burnt Orange?

The same difference applies the other way round: Resplendent 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.