Aluminium vs Hammered Copper

How close are they?

ΔE 9.5, close: similar, with a visible difference side by side. Hammered Copper is a little lighter, more saturated than Aluminium.

Can I use Hammered Copper instead of Aluminium?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Hammered Copper is a little lighter, more saturated than Aluminium.

Can I use Aluminium instead of Hammered Copper?

The same difference applies the other way round: Aluminium is a little darker, 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.