Mordant Earth vs Primer Black Brown

How close are they?

ΔE 14.9, fair: the same colour family, but not a straight swap. Primer Black Brown is noticeably darker, more muted than Mordant Earth.

Can I use Primer Black Brown instead of Mordant Earth?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Primer Black Brown is noticeably darker, more muted than Mordant Earth.

Can I use Mordant Earth instead of Primer Black Brown?

The same difference applies the other way round: Mordant Earth is noticeably 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.