French Blue vs Sombre Grey

How close are they?

ΔE 5.0, very close: most people won’t see a difference side by side. Sombre Grey is a little darker, warmer than French Blue.

Can I use Sombre Grey instead of French Blue?

Yes, for most jobs. Very close match (ΔE 5). Sombre Grey is a little darker, warmer than French Blue.

Can I use French Blue instead of Sombre Grey?

The same difference applies the other way round: French Blue is a little lighter, cooler.

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.