Titan Green Pale vs Light Blue

How close are they?

ΔE 6.2, close: similar, with a visible difference side by side. Light Blue is a little darker, cooler than Titan Green Pale.

Can I use Light Blue instead of Titan Green Pale?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Light Blue is a little darker, cooler than Titan Green Pale.

Can I use Titan Green Pale instead of Light Blue?

The same difference applies the other way round: Titan Green Pale 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.