Dark Boot Brown vs Ashen Grey

How close are they?

ΔE 10.0, close: similar, with a visible difference side by side. Ashen Grey is a little lighter, more muted than Dark Boot Brown.

Can I use Ashen Grey instead of Dark Boot Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Ashen Grey is a little lighter, more muted than Dark Boot Brown.

Can I use Dark Boot Brown instead of Ashen Grey?

The same difference applies the other way round: Dark Boot Brown is a little darker, 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.