Marine Blue vs Imperial Blue

How close are they?

ΔE 16.3, loose: different enough that you should pick on purpose. Imperial Blue is much more saturated than Marine Blue.

✓ Two Thin Coats comparison chart lists these two as equivalents.

Can I use Imperial Blue instead of Marine Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Imperial Blue is much more saturated than Marine Blue.

Can I use Marine Blue instead of Imperial Blue?

The same difference applies the other way round: Marine Blue is much 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.