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 PR101 Red Iron Oxide + PY42 Yellow Iron Oxide.
A hue: a substitute for Naples Yellow, made with other pigments.
Who makes it
PY37 Cadmium Yellow + PY43 Yellow Ochre / Raw Sienna1
- PY43 PY37 PW6 PW4LF IHue37 ml tube · 150 ml tube · 8 fl oz can · 16 fl oz can · 32 fl oz can*About Gamblin
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.