Best Portable Watercolor Set (2026): "Hue" Means a Substitute Pigment

Student grade against artist grade

The distinction is pigment, and manufacturers are usually honest about it if you read the description.

Winsor & Newton state that Cotman colours are made to their standards but that costs are kept economical by replacing some of the more expensive pigments with less costly alternatives. That is what you are buying at student grade, and it shows in the colour names: Cadmium Yellow Hue, Cadmium Red Pale Hue, Alizarin Crimson Hue, Viridian Hue. Four of the twelve.

"Hue" means "looks like". The real pigment is expensive — genuine cadmium and cobalt are costly, and some traditional pigments are toxic or no longer made — so a mixture approximates the appearance.

What you give up is tinting strength, transparency and lightfastness. A student cadmium hue goes muddy faster when mixed and may shift over years on a wall.

Artist grade uses single genuine pigments, which mix more predictably and stay put.

For sketchbook work that lives in a sketchbook, student grade is genuinely fine. For anything framed, it matters.

Pans, tubes and what to carry

Pans are dried cakes of paint you wet with a brush. They are the right answer for sketching outdoors: nothing to spill, nothing to dry out, and the box is the palette. Half pans are the small ones and are what almost every pocket set uses.

Tubes are wet paint. They give stronger, more saturated washes and are far better for large areas, but they need squeezing onto a palette and they dry out if you leave them. Studio tools rather than field ones.

A dozen colours is genuinely enough. More colours mean less mixing, and mixing is how you learn what watercolour does. A useful minimum is a warm and a cool version of each primary plus an earth colour or two, which is roughly what the Cotman set here contains.

The lid is a real feature. A pocket box with a built-in mixing palette means you need no separate surface, and the Cotman box has one. Without it you end up mixing on the back of your hand.

And take a water brush — a barrel you fill with water — rather than a jar you will knock over.

Twelve colours you can mix anything from

A useful palette is not a big one. The principle is a warm and a cool version of each primary, because mixing two colours that lean the same way stays clean and mixing opposites goes grey.

Yellows — a cool lemon and a warm cadmium-ish yellow.

Reds — a cool crimson leaning blue and a warm scarlet leaning orange.

Blues — a warm ultramarine leaning purple and a cool phthalo leaning green.

Earths — yellow ochre, burnt sienna and burnt umber do most of the work in urban sketching, because buildings and streets are largely earth colours.

A green is optional, since ultramarine and lemon make better greens than most tube greens, which tend to look artificial.

That is roughly the Cotman twelve, which is why it is a well-chosen set rather than an arbitrary dozen.

Skip black. Mixing a dark from ultramarine and burnt sienna gives a far livelier shadow than tube black, which flattens everything it touches.