3 different recipes. Brands sell different pigment mixtures under this name, so they won't all look or mix alike. Compare the pigments below.
Who makes it
PR254 Pyrrole Red1
- PR254LF I Semi-opaqueSeries 220 ml tube · 40 ml tube · 60 ml tube · 200 ml tube* · 500 ml tin*About Royal Talens
PR255 Pyrrole Scarlet1
- Lukas 1862 Artists' Oil No. 0100
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.