Moonbeam Yellow vs Arylide Yellow Deep

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Arylide Yellow Deep is more muted than Moonbeam Yellow.

Can I use Arylide Yellow Deep instead of Moonbeam Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Arylide Yellow Deep is more muted than Moonbeam Yellow.

Can I use Moonbeam Yellow instead of Arylide Yellow Deep?

The same difference applies the other way round: Moonbeam Yellow is 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.