Semi Gloss Black vs Signal Blue

How close are they?

ΔE 11.4, fair: the same colour family, but not a straight swap. Signal Blue is a little lighter, more saturated than Semi Gloss Black.

Can I use Signal Blue instead of Semi Gloss Black?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Signal Blue is a little lighter, more saturated than Semi Gloss Black.

Can I use Semi Gloss Black instead of Signal Blue?

The same difference applies the other way round: Semi Gloss Black 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.