Cygor Brown vs Radiant Orange

How close are they?

ΔE 23.6, loose: different enough that you should pick on purpose. Radiant Orange is a little lighter, much more saturated, warmer than Cygor Brown.

Can I use Radiant Orange instead of Cygor Brown?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Radiant Orange is a little lighter, much more saturated, warmer than Cygor Brown.

Can I use Cygor Brown instead of Radiant Orange?

The same difference applies the other way round: Cygor Brown is a little darker, much more muted, 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.