Caesar Red vs Forged Red

How close are they?

ΔE 31.8, loose: different enough that you should pick on purpose. Forged Red is noticeably darker, much more saturated, warmer than Caesar Red.

Can I use Forged Red instead of Caesar Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 32). Forged Red is noticeably darker, much more saturated, warmer than Caesar Red.

Can I use Caesar Red instead of Forged Red?

The same difference applies the other way round: Caesar Red is noticeably lighter, 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.