Yriel Yellow vs Marigold Yellow

How close are they?

ΔE 33.0, loose: different enough that you should pick on purpose. Marigold Yellow is noticeably darker, much more muted, warmer than Yriel Yellow.

Can I use Marigold Yellow instead of Yriel Yellow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 33). Marigold Yellow is noticeably darker, much more muted, warmer than Yriel Yellow.

Can I use Yriel Yellow instead of Marigold Yellow?

The same difference applies the other way round: Yriel Yellow is noticeably lighter, much more saturated, cooler.

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.