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 Oxide5
- Rembrandt Artists' Oil Colour No. 378
- Schmincke Mussini Resin-Oil No. 10365
- PR101LF I TransparentSeries 240 ml tube · 150 ml tube · 300 ml cartridge · 500 ml tin · 1000 ml tin* · 4000 ml tin*About Art Spectrum
- PR101LF I TransparentSeries 340 ml tube · 110 ml tube · 300 ml tube · 1000 ml tin · 4000 ml tinAbout Langridge
Pigments unconfirmed1
- Holbein Artists' Oil Color No. H360
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.