Fluor Red vs Fresh Blood

How close are they?

ΔE 19.0, loose: different enough that you should pick on purpose. Fresh Blood is a little lighter, more muted, cooler than Fluor Red.

Can I use Fresh Blood instead of Fluor Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Fresh Blood is a little lighter, more muted, cooler than Fluor Red.

Can I use Fluor Red instead of Fresh Blood?

The same difference applies the other way round: Fluor Red 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.