Carbon Black vs Signal Blue

How close are they?

ΔE 13.3, fair: the same colour family, but not a straight swap. Signal Blue is noticeably lighter, more saturated than Carbon Black.

Can I use Signal Blue instead of Carbon Black?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Signal Blue is noticeably lighter, more saturated than Carbon Black.

Can I use Carbon Black instead of Signal Blue?

The same difference applies the other way round: Carbon Black is noticeably 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.