Turquoise Siren vs Seraphon Blue

How close are they?

ΔE 12.0, fair: the same colour family, but not a straight swap. Seraphon Blue is noticeably darker than Turquoise Siren.

Can I use Seraphon Blue instead of Turquoise Siren?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Seraphon Blue is noticeably darker than Turquoise Siren.

Can I use Turquoise Siren instead of Seraphon Blue?

The same difference applies the other way round: Turquoise Siren 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.