Yriel Yellow vs Intense Yellow

How close are they?

ΔE 9.0, close: similar, with a visible difference side by side. Intense Yellow is a little darker than Yriel Yellow.

Can I use Intense Yellow instead of Yriel Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Intense Yellow is a little darker than Yriel Yellow.

Can I use Yriel Yellow instead of Intense Yellow?

The same difference applies the other way round: Yriel Yellow 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.