Aether Blue vs Violet Wash

How close are they?

ΔE 26.3, loose: different enough that you should pick on purpose. Violet Wash is much more saturated, warmer than Aether Blue.

Can I use Violet Wash instead of Aether Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Violet Wash is much more saturated, warmer than Aether Blue.

Can I use Aether Blue instead of Violet Wash?

The same difference applies the other way round: Aether Blue is much more muted, cooler.

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.