Rock Grey vs Underhive Ash

How close are they?

ΔE 5.7, very close: most people won’t see a difference side by side. Underhive Ash is a little darker, more muted, cooler than Rock Grey.

Can I use Underhive Ash instead of Rock Grey?

Yes, for most jobs. Very close match (ΔE 6). Underhive Ash is a little darker, more muted, cooler than Rock Grey.

Can I use Rock Grey instead of Underhive Ash?

The same difference applies the other way round: Rock Grey is a little lighter, more saturated, warmer.

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.