Rakarth Flesh vs Bright Brown Grey

How close are they?

ΔE 8.8, close: similar, with a visible difference side by side. Bright Brown Grey is a little darker, warmer than Rakarth Flesh.

Can I use Bright Brown Grey instead of Rakarth Flesh?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Bright Brown Grey is a little darker, warmer than Rakarth Flesh.

Can I use Rakarth Flesh instead of Bright Brown Grey?

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