Saphire Blue vs Baharroth Blue

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Baharroth Blue is more muted than Saphire Blue.

Can I use Baharroth Blue instead of Saphire Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Baharroth Blue is more muted than Saphire Blue.

Can I use Saphire Blue instead of Baharroth Blue?

The same difference applies the other way round: Saphire Blue is more saturated.

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.