The question we hear more than any other is simple: what is the best watercolour paint? The honest answer is that the best watercolour is the one made to professional standards - high pigment load, single-pigment formulation where possible, and lightfastness published for every colour. The difference between professional and student watercolour is not marketing; it is measurable, and it shows on the paper.
What separates professional from student watercolour?
The defining factor is pigment load - the ratio of pigment to gum binder. Professional watercolours are milled to the maximum saturation each pigment can hold, so a wet brush picks up dense, saturated colour. Student watercolours cut the pigment with extenders to lower the cost, which weakens the wash and dulls the mixes.
Second is single-pigment formulation. A professional range uses one pigment per colour wherever the colour can be achieved with one, so the paint mixes cleanly and shows its transparency and granulation honestly. Student ranges often blend several pigments into a "hue" that approximates an expensive pigment but muddies quickly.
Third is documented lightfastness. Professional watercolour publishes the pigment's Colour Index code, lightfastness, transparency and granulation on every colour. Student watercolours rarely publish this, and some use dye-based pigments that fade.
How to tell them apart when you buy
- Read the label for a pigment code (for example PB29 for Ultramarine Blue). No code usually means a blend or an undisclosed pigment.
- Look for a lightfastness rating - ASTM I or II, or Blue Wool 7-8, for anything you intend to frame.
- Test the wash strength - a professional pan should release dense colour the moment it wets.
Does price equal quality?
Not exactly. The price of a professional watercolour reflects the cost of the pigment, not the quality of the making. A Series 1 colour is not a lower-grade paint than a Series 6; both are made to the same professional standard. Student watercolour is cheaper because it contains less pigment and more extender - not because it is made carelessly, but because it is designed to a price.
The verdict
If you are learning, a small set of professional single-pigment colours will teach you more about mixing and behaviour than a large box of student "hues". See our Best Watercolours guide for named recommendations, browse the full watercolour range with technical data for every colour, or explore the curated watercolour sets.