Charcoal takes the dark. Graphite takes the edge.

Charcoal and graphite are not two shades of one tool. Charcoal is carbonised wood — loose particles that sit on top of the sheet and scatter almost no light back, which is why it reaches a black graphite cannot. Vine and willow are the softest; they dust off with a chamois, so they are the honest choice for a block-in you expect to move. Compressed charcoal is powder bound with gum: dense, biting, and never fully erasable.

Graphite is a crystalline mineral that lies flat and shines. That sheen is the trade — an 8B goes dark, but grey-silver dark, and under raking light it glares back.

Choose by surface: charcoal wants tooth, graphite wants smooth, well-sized stock.

Every mark carries two things at once: how dark it is, and which way the form turns.

Hatching builds value from parallel strokes — spacing and pressure set the tone, direction states the plane. Cross-hatching layers a second angle over the first, deepening value in passes without crushing the paper's tooth. Contour hatching curves the strokes along the form, so value and volume arrive together. Scumbling is a loose circular scribble that reads as texture rather than direction: forgiving, and good for foliage, hair and stone. Stippling trades speed for control, dots accumulating into a soft grain.

Then the broad side stroke: a stick laid flat and dragged, covering a passage in one pass with no visible line at all. Two variables run through all of it — pressure changes value, angle changes the width and character of the stroke. A sharpened point and the same stick on its side are effectively two tools.

A value study is a drawing about light, not outline. Squint until detail collapses and only the large tonal shapes survive — draw those first. Block the whole subject in at five values before you touch a sixth, and reserve the lightest light and the darkest dark: spend either in the first ten minutes and the rest of the drawing has nowhere to go.

Judge every tone as a relationship. The question is never "how dark is this shadow" but "is it darker than the one beside it, and by how many steps". Decide the key early — a high-key drawing lives in the top half of the scale, a low-key one in the bottom, and mixing them without intent is the usual reason a study reads muddy. Treat edges as part of value: soft where a form turns slowly, hard where planes meet or a cast shadow lands.

Blending pushes particles into the tooth of the paper; lifting pulls them back out. Both are easier to overdo than to undo.

A stump or tortillon blends small passages with control; a chamois or soft mop brush moves large ones. Avoid fingers — skin oil leaves a mark that resists erasing and dulls whatever you lay on top. Lift with a kneaded eraser by pressing and rolling rather than rubbing, and reshape it to a point for highlights a few millimetres wide. A hard plastic eraser cuts crisp lights; an eraser shield keeps the cut where you want it.

Charcoal lives on the surface, so protect it. A light coat of workable fixative between layers locks what is down and returns a fresh tooth to draw into; save the final coat for the end, knowing it will deepen values slightly. Work top to bottom, and rest your hand on a spare sheet.