Rlyeh Grey vs Intermediate Blue

How close are they?

ΔE 12.0, fair: the same colour family, but not a straight swap. Intermediate Blue is a little lighter, more saturated than Rlyeh Grey.

Can I use Intermediate Blue instead of Rlyeh Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Intermediate Blue is a little lighter, more saturated than Rlyeh Grey.

Can I use Rlyeh Grey instead of Intermediate Blue?

The same difference applies the other way round: Rlyeh Grey is a little darker, more muted.

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.