Purple Vanity vs Legacy Blue

How close are they?

ΔE 8.4, close: similar, with a visible difference side by side. Legacy Blue is a little darker, more saturated, cooler than Purple Vanity.

Can I use Legacy Blue instead of Purple Vanity?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Legacy Blue is a little darker, more saturated, cooler than Purple Vanity.

Can I use Purple Vanity instead of Legacy Blue?

The same difference applies the other way round: Purple Vanity is a little lighter, more muted, 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.