2 different recipes. Brands sell different pigment mixtures under this name, so they won't all look or mix alike. Compare the pigments below; the most common is PR254 Pyrrole Red.
Who makes it
PR254 Pyrrole Red6
- Holbein Artists' Oil Color No. H228
- Williamsburg Handmade Oil Colors No. 6001925PR254LF I Semi-opaqueSeries 437 ml tube · 150 ml tube · 8 fl oz can* · 16 fl oz can*About Williamsburg
- Daler-Rowney Georgian (student)Student No. D111014512
- PR254LF I OpaqueSeries 440 ml tube · 150 ml tube · 300 ml cartridge · 500 ml tin · 1000 ml tin* · 4000 ml tin*About Art Spectrum
- PR254LF I OpaqueSeries 440 ml tube · 110 ml tube · 300 ml tube · 1000 ml tin · 4000 ml tinAbout Langridge
PR255 Pyrrole Scarlet1
- Grumbacher Pre-Tested Artists' Oil No. P312
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.