Tone and form: the tonal scale from light to dark, how light falling on an object creates highlights, mid-tones, core shadow and reflected light, and how to use a full tonal range to model three-dimensional form.

What this dot point is asking

Tone is the lightness or darkness of a surface, and it is the chief tool for creating the illusion of three-dimensional form. This dot point is about the tonal scale, how light falling on an object creates a predictable set of tones, and how to use a full tonal range to model form convincingly. Tone underpins observational recording (AO3) and a controlled, communicating outcome (AO4), so mastering it is central to the formal elements.

The tonal scale

Tone runs on a scale from white through greys to black. The first discipline is to use the whole scale, not a narrow band in the middle. Make a tonal scale yourself, stepping from the lightest your medium allows to the darkest, so you know its range. Then, when you draw, push your lights genuinely light and your darks genuinely dark. A drawing that stays in mid-greys looks flat and lifeless; one that uses the full range has the contrast that makes form read.

How light creates form

Form is created when you map the tones light actually makes on an object. On a rounded form lit from one side, the brightest point is the highlight, where light hits directly. Moving away from it, the surface turns through mid-tones. The darkest part is the core shadow, the band where the surface turns fully away from the light, and it is darker than the cast shadow. Within the shadow, a slightly lighter reflected light appears, bounced from the surface beneath. Reading and rendering these in order is what makes an object look solid.

Using a full tonal range

The commonest reason a drawing looks flat is a timid tonal range. Students often stop short of true darks, fearing the drawing will look "too dark", and avoid clean lights, so everything sits in a grey middle. But the eye reads contrast as form: without real lights and darks, nothing turns toward or away from the light. So commit to the full range, build up genuine darks in the core shadow and keep highlights clean (lifting out or leaving paper), with smooth mid-tones between. A full range is the difference between a flat grey shape and a convincing form.

Building tone with your medium

How you build tone depends on the medium, which links tone to mark-making. In pencil or pen you build tone with hatching and cross-hatching, layering marks for darker values. In charcoal you build broad soft mass and lift out highlights with an eraser. In paint you mix lighter and darker values. Whatever the medium, work from a careful reading of the light, and keep transitions smooth on rounded forms and crisp on hard edges. The medium shapes how tone is made, but the tonal logic, highlight to core shadow, stays the same.

Try this

Q1. Name the tones light creates on a rounded form, from brightest to darkest, plus the cast shadow. [Knowledge recall]

• Cue. Highlight (brightest), mid-tones (turning surface), reflected light (a lighter area within the shadow) and core shadow (darkest band on the object), plus the cast shadow the object throws onto its surface to anchor it.

Q2. Explain why a drawing in only mid-tones looks flat and how a fuller range fixes it. [Short explanation]

• Cue. The eye reads the contrast between light and dark as volume, so a narrow band of mid-greys gives nothing that reads as turning toward or away from the light and looks flat; pushing the lights lighter and the darks darker, with mid-tones between, creates the contrast that makes the surface read as three-dimensional.