Deep Blue vs Calth Blue Clear

How close are they?

ΔE 14.5, fair: the same colour family, but not a straight swap. Calth Blue Clear is noticeably darker than Deep Blue.

Can I use Calth Blue Clear instead of Deep Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Calth Blue Clear is noticeably darker than Deep Blue.

Can I use Deep Blue instead of Calth Blue Clear?

The same difference applies the other way round: Deep Blue is noticeably lighter.

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.