Calth Blue Clear vs Cerulean Blue, Chromium

How close are they?

ΔE 12.5, fair: the same colour family, but not a straight swap. Cerulean Blue, Chromium is noticeably lighter than Calth Blue Clear.

Can I use Cerulean Blue, Chromium instead of Calth Blue Clear?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Cerulean Blue, Chromium is noticeably lighter than Calth Blue Clear.

Can I use Calth Blue Clear instead of Cerulean Blue, Chromium?

The same difference applies the other way round: Calth Blue Clear is noticeably darker.

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.