Violent Vermillion vs Midlund Flesh

How close are they?

ΔE 21.1, loose: different enough that you should pick on purpose. Midlund Flesh is a little lighter, much more muted, warmer than Violent Vermillion.

Can I use Midlund Flesh instead of Violent Vermillion?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Midlund Flesh is a little lighter, much more muted, warmer than Violent Vermillion.

Can I use Violent Vermillion instead of Midlund Flesh?

The same difference applies the other way round: Violent Vermillion is a little 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.