As we discussed before one of key paint components is pigment powder. Different pigments produce different colours, providing different grade of brightness, light fastness, transparency etc. Some of pigments are very expensive like cadmium and cobalt:
- Cadmium red
- Cadmium yellow
- Cadmium orange
- Cobalt blue
- Cobalt green
- Cobalt violet (the most expensive)
None of other pigments of red or blue shades have that high coverage and purity. Since these pigments are quite expensive some manufactures replace them with some other pigments, of course cheaper ones. If they do so, they mark labels with HUE sign to show that this specific colour is just an imitation and not real. HUE colours are less predictable in mixing and less intense. However, HUE colours have some benefits: they are not so toxic as real cobalt or cadmium.
Professional grade paints (like Master Class, Maimeri PURO, White Nights) have always real pigments, not HUE. Some artist grade paints like Maimeri Classico have real ones as well, with less pigment load though. Student and artist grade paints have HUE colours for cadmium (Ladoga, Sonnet , Winton, Van Gogh etc.).