Deep Yellow vs Plague Brown

How close are they?

ΔE 12.8, fair: the same colour family, but not a straight swap. Plague Brown is a little darker, more muted than Deep Yellow.

Can I use Plague Brown instead of Deep Yellow?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Plague Brown is a little darker, more muted than Deep Yellow.

Can I use Deep Yellow instead of Plague Brown?

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