Tyran Blue vs Flesh Wash

How close are they?

ΔE 64.8, loose: different enough that you should pick on purpose. Flesh Wash is noticeably lighter, much more muted, warmer than Tyran Blue.

Can I use Flesh Wash instead of Tyran Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 65). Flesh Wash is noticeably lighter, much more muted, warmer than Tyran Blue.

Can I use Tyran Blue instead of Flesh Wash?

The same difference applies the other way round: Tyran Blue is noticeably darker, much more saturated, 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.