Blue Gray vs Runic Cobalt

How close are they?

ΔE 12.4, fair: the same colour family, but not a straight swap. Runic Cobalt is a little lighter, warmer than Blue Gray.

Can I use Runic Cobalt instead of Blue Gray?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Runic Cobalt is a little lighter, warmer than Blue Gray.

Can I use Blue Gray instead of Runic Cobalt?

The same difference applies the other way round: Blue Gray is a little darker, 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.