2 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
PB15 Phthalo Blue + PB28 Cobalt Blue1
- PW6 PB15:3 PB28LF I OpaqueSeries 340 ml tube · 110 ml tube · 300 ml tube · 1000 ml tin · 4000 ml tinAbout Langridge
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.