Blood Red vs Frenzy Orange

How close are they?

ΔE 17.0, loose: different enough that you should pick on purpose. Frenzy Orange is a little lighter, warmer than Blood Red.

Can I use Frenzy Orange instead of Blood Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Frenzy Orange is a little lighter, warmer than Blood Red.

Can I use Blood Red instead of Frenzy Orange?

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