What is charcoal in fine art? A painter's guide to fusain

Charcoal is often mistaken for a rehearsal - the black stick a student uses to block out a pose before the real work begins in paint. That reputation is old, and it is inaccurate. Charcoal, fusain in French, is a finished medium with a long history of its own, able to hold a subject as completely as oil.

In my studio in Lille I work in charcoal alongside collage, oil and raw pigment, and I rarely treat it as a step toward something else. More often it is the thing itself: a head, a figure, a mass of black that has weight and breath. This guide explains what charcoal is as fine art, how to read a charcoal work when you stand in front of one, and why a good one endures.

What fusain actually is

Charcoal is charred wood, usually willow or vine, reduced almost entirely to carbon. In its softest form it comes as fragile sticks that crumble under pressure and leave a velvety, blue-black mark. Compressed charcoal, bound with a little gum, gives a denser and more permanent black that resists smudging. Between these extremes a painter finds an enormous range of greys, from a breath of grey mist to something close to tar.

What matters is that the pigment is pure carbon. Carbon does not fade. The same material that recorded animals on cave walls tens of thousands of years ago is still legible today, which tells you something about how a charcoal work can behave over time when it is looked after.

Why it was treated as preparatory - and why that changed

For centuries charcoal was the language of the preparatory drawing: the cartoon squared up for transfer, the quick study made and then discarded. Because it was cheap, forgiving and erasable, it became associated with the idea of a draft. That association stuck long after artists had begun making charcoal works meant to stand on their own.

The shift, when it came, was less a technical revolution than a change of intent. A drawing becomes a finished work the moment the artist stops treating the surface as provisional and starts building it - darkening, lifting, layering - until the image is resolved rather than merely indicated. The medium did not need to change. The regard for it did.

How to read a charcoal work

Standing in front of a charcoal painting, it helps to slow down and look for a few specific things.

• Depth of black. The darkest passages are where the artist has committed most. A convincing black is rarely flat; it holds small variations that keep it alive rather than dead.
• The lifted light. In charcoal, light is often taken away rather than added - pulled out of the black with a kneaded eraser, a cloth or a finger. Those recovered highlights are where the drawing breathes.
• The edge. Notice where a form is sharp and where it dissolves. A figure that is crisp along one contour and lost along another is doing something more interesting than a fully described one.
• The ground. Charcoal on white paper reads differently from charcoal worked into a toned or collaged surface. The support is part of the picture.

Charcoal in my own practice

My charcoal works and painted heads share the same instinct: I am always looking for an earlier subject, one that appears through viewpoints that converge into a single prism. Charcoal suits that search because it can be built and unbuilt endlessly. I darken a head until it is almost buried, then lift it back into the light, and somewhere in that exchange a face surfaces and half-dissolves into the material again.

The heads series - Portrait blanc, Portrait rouge, Bouddha - grew directly out of this way of working. It is also the technique I taught the actress Léa Seydoux when I served as pictorial adviser on Abdellatif Kechiche's Blue Is the Warmest Colour, so that her gestures at the easel would carry the weight of the real thing.

Why a charcoal painting endures

Because the pigment is inert carbon, the main threats to a charcoal work are physical rather than chemical: abrasion, smudging and dust. A well-made charcoal painting, properly fixed and framed behind glass, is remarkably stable. Museums hold charcoal drawings centuries old that remain crisp. The medium's fragility is a handling problem, not a longevity problem - and handling is easily managed once you know how.

Frequently asked questions

Is charcoal a permanent medium?

Yes. Charcoal is almost pure carbon, which does not fade or change colour with age. The vulnerability is mechanical - the loose pigment can be disturbed - so a finished charcoal work is fixed and framed under glass to protect the surface.

What is the difference between charcoal and fusain?

They are the same thing. Fusain is simply the French word for artists' charcoal, and it is often used in English to signal fine-art charcoal as distinct from the everyday sense of the word.

Is a charcoal work worth less than an oil painting?

Not inherently. Value follows the strength of the work, its scale and ambition, and its place in an artist's body of work, not the price of the material. A resolved charcoal painting is a finished work, not a study.

Can charcoal be combined with other media?

Readily. In my own paintings charcoal sits alongside collage, oil and raw pigment, each layer answering the last. The combination is part of why the surfaces have depth.

If you would like to see how charcoal behaves in person, the collection is the place to begin, and you are welcome to write to the studio to arrange a viewing in Lille.