Copper vs True Brass

How close are they?

ΔE 22.0, loose: different enough that you should pick on purpose. True Brass is a little lighter, more muted, cooler than Copper.

Can I use True Brass instead of Copper?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). True Brass is a little lighter, more muted, cooler than Copper.

Can I use Copper instead of True Brass?

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