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 PB35 Cerulean Blue.
Who makes it
PB35 Cerulean Blue12
- Grumbacher Pre-Tested Artists' Oil No. P040
- Holbein Artists' Oil Color No. H305
- Old Holland Classic Oil Colours No. F39PB35LF ISeries F18 ml tube* · 40 ml tube · 60 ml tube* · 125 ml tube · 225 ml tube · 475 ml tin* · 1000 ml tin*About Old Holland
- Rembrandt Artists' Oil Colour No. 534PB35LF I Semi-transparentSeries 515 ml tube · 40 ml tube · 60 ml tube* · 150 ml tube*About Rembrandt
- PB35LF I Semi-transparentSeries 440 ml tube · 150 ml tube · 300 ml cartridge · 500 ml tin · 1000 ml tin* · 4000 ml tin*About Art Spectrum
- PB35LF I Semi-opaqueSeries 220 ml tube · 40 ml tube · 60 ml tube · 200 ml tube* · 500 ml tin*About Royal Talens
PB36 Cobalt Turquoise / Cerulean6
- M. Graham Artists' Oil Color No. 080
- PB36LF I OpaqueSeries 640 ml tube · 110 ml tube · 300 ml tube · 1000 ml tin · 4000 ml tinAbout Langridge
- Maimeri Puro Oil Colours No. 368
- Lukas 1862 Artists' Oil No. 0121
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.