Slate Grey vs Intermediate Blue

How close are they?

ΔE 12.6, fair: the same colour family, but not a straight swap. Intermediate Blue is a little lighter, more saturated than Slate Grey.

Can I use Intermediate Blue instead of Slate Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Intermediate Blue is a little lighter, more saturated than Slate Grey.

Can I use Slate Grey instead of Intermediate Blue?

The same difference applies the other way round: Slate 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.