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 PY53 Nickel Titanate Yellow.
Who makes it
PY53 Nickel Titanate Yellow2
- Maimeri Puro Oil Colours No. 109
PG18 Viridian + PY3 Arylide Yellow 10G + PY53 Nickel Titanate Yellow1
- Grumbacher Pre-Tested Artists' Oil No. P148
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.