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 PB36 Cobalt Turquoise / Cerulean.
Who makes it
PB36 Cobalt Turquoise / Cerulean3
- M. Graham Artists' Oil Color No. 098
- Holbein Artists' Oil Color No. H316
PG50 Cobalt Titanate Green / Teal2
- Grumbacher Pre-Tested Artists' Oil No. P309
- Schmincke Mussini Resin-Oil No. 10498
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.