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 PR101 Red Iron Oxide.
Who makes it
PR101 Red Iron Oxide12
- Grumbacher Pre-Tested Artists' Oil No. P110
- Holbein Artists' Oil Color No. H346
- PR101LF I Semi-opaqueSeries 140 ml tube · 60 ml tube* · 225 ml tube · 1000 ml can*About Michael Harding
- Rembrandt Artists' Oil Colour No. 347
- Daler-Rowney Georgian (student)Student No. D111014523
- PR101LF I OpaqueSeries 140 ml tube · 150 ml tube · 300 ml cartridge · 500 ml tin · 1000 ml tin* · 4000 ml tin*About Art Spectrum
- PR101LF I OpaqueSeries 220 ml tube · 40 ml tube · 60 ml tube · 200 ml tube* · 500 ml tin*About Royal Talens
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.