RAF Sky / FS 34424 vs IJA Grey Green

How close are they?

ΔE 5.6, very close: most people won’t see a difference side by side. IJA Grey Green is a little darker, warmer than RAF Sky / FS 34424.

Can I use IJA Grey Green instead of RAF Sky / FS 34424?

Yes, for most jobs. Very close match (ΔE 6). IJA Grey Green is a little darker, warmer than RAF Sky / FS 34424.

Can I use RAF Sky / FS 34424 instead of IJA Grey Green?

The same difference applies the other way round: RAF Sky / FS 34424 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.