3 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 PB74 Cobalt Blue Deep.
Who makes it
PB74 Cobalt Blue Deep6
- Old Holland Classic Oil Colours No. E38PB74LF ISeries E18 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. 515
- Schmincke Mussini Resin-Oil No. 10481
- PB74LF I Semi-transparentSeries 440 ml tube · 150 ml tube · 300 ml cartridge · 500 ml tin · 1000 ml tin* · 4000 ml tin*About Art Spectrum
- Maimeri Puro Oil Colours No. 374
PB28 Cobalt Blue2
- Holbein Artists' Oil Color No. H303
- Williamsburg Handmade Oil Colors No. 6000937PB28LF I Semi-opaqueSeries 737 ml tube · 150 ml tube · 8 fl oz can* · 16 fl oz can*About Williamsburg
PB72 Cobalt Blue Deep1
- Grumbacher Pre-Tested Artists' Oil No. P310
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.