3 different recipes. Brands sell different pigment mixtures under this name, so they won't all look or mix alike. Compare the pigments below.
Who makes it
PY150 Nickel Azo Yellow1
- Schmincke Mussini Resin-Oil No. 10238
PY155 Bisacetoacetarylide Yellow1
- Maimeri Puro Oil Colours No. 122
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.