Sapphire Blue vs Unders. Blue “Faded”

How close are they?

ΔE 14.6, fair: the same colour family, but not a straight swap. Unders. Blue “Faded” is a little darker, cooler than Sapphire Blue.

Can I use Unders. Blue “Faded” instead of Sapphire Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Unders. Blue “Faded” is a little darker, cooler than Sapphire Blue.

Can I use Sapphire Blue instead of Unders. Blue “Faded”?

The same difference applies the other way round: Sapphire Blue is a little lighter, warmer.

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.