Ratskin Flesh vs Mars Yellow

How close are they?

ΔE 9.9, close: similar, with a visible difference side by side. Mars Yellow is a little darker, more saturated than Ratskin Flesh.

Can I use Mars Yellow instead of Ratskin Flesh?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Mars Yellow is a little darker, more saturated than Ratskin Flesh.

Can I use Ratskin Flesh instead of Mars Yellow?

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

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.