The reason I rate Winsor and Newton Cotman student watercolours so highly is the quality - you can view my video on the differences to find out more on how they compare with the professional colours. If you compare this set with the professional colours of the same names, with the exceptions of the "hues", they all have the same pigments as the artist's grade - just less of it, so some are padded out with "fillers" - a chalk-like mineral, which can make student watercolours feel a bit "gouache-y" and more opaque than an authentic one, but Cotman are pretty good. As for what hues are, they are simply "honest fakes" - real Cadmium Yellow uses a cadmium sulfoselenide as the pigment (PY35), the "hue" in the Cotman series uses two dyes - diarylide yellow FGL (PY97) and hansa yellow 65 (PY65) - to give a pretty close match the real thing as:
1) they're much cheaper to manufacture (true Cadmium Yellow is one of the most expensive colours, at £8.80/tube = £17.60/10mL, whereas this "hue" is a mere £2.60/tube = £3.25/10mL - just under 20% of the price!) and
2) less toxic, but they won't mix in quite the same way or behave in quite the same way - hues of normally granulating colours have a granulation medium added to them to try and make them look more authentic)
The Student Palette
[Est. price based on RRP of £2.60 per tube, £31.20 = US$45.60 = €40.00 = C$57.00 = A$60.00]
This palette is essentially the same as my 12-colour Basic Palette of professional watercolours - I've made one substitution, basically, as one of the colours doesn't have a Cotman version or even a close equivalent.
346 Lemon Yellow (Hue)
109 Cadmium Yellow (Hue)
744 Yellow Ochre
502 Permanent Rose
095 Cadmium Red
317 Indian Red
327 Intense Blue (Phthalo Blue)
660 Ultramarine
654 Turquoise
554 Raw Umber
074 Burnt Sienna
076 Burnt Umber
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