Amethyst Rose vs Dark Red

How close are they?

ΔE 7.8, close: similar, with a visible difference side by side. Dark Red is more muted, cooler than Amethyst Rose.

Can I use Dark Red instead of Amethyst Rose?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Dark Red is more muted, cooler than Amethyst Rose.

Can I use Amethyst Rose instead of Dark Red?

The same difference applies the other way round: Amethyst Rose is more saturated, warmer.

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.