Wax and cling film: two resists that behave nothing alike
This is the one technique in the series where the surface texture is made by something other than a brush. Wax creates a negative shape you plan in advance; cling film creates a crystalline structure you can only partly predict. Used together on the same sheet they cover each other's weaknesses.
Teal — Blue-green between turquoise and viridian.
| Pigment | Parts | Hex |
|---|---|---|
| Cobalt Turquoise | 3 : 6 (50%) | #4E9E9C |
| Viridian | 2 : 6 (33%) | #3F7A4E |
| French Ultramarine | 1 : 6 (17%) | #2E4A7D |
- Draw the core shape with a white wax candle stub, pressing hard enough to leave a visible film. Soft wax gives a soft reserve; hard wax gives a crisp one.
- Wet the whole sheet with a 40 mm hake and let it go matte.
- Flood a soaked wash of cobalt turquoise over the whole area, straight across the wax. Do not try to paint around the wax.
- While the surface is still glossy, lay a sheet of cling film over the wet paint and press it gently with the flat of your hand.
- Scrunch the film into ridges with two fingers, then leave it completely alone until the paint is dry — at least forty minutes, longer in a humid room.
- Peel the film slowly from one corner. Slow peeling gives sharp crystalline lines; fast peeling gives broad soft blotches.
- Add viridian and a touch of ultramarine in a second pass only where the crystalline texture needs a value anchor. The wax will resist those too.
- Remove the wax by ironing the back over clean newsprint, or accept it as a permanent element of the surface.
Wax reserves shape, film reserves structure
Candle wax sits on the paper and physically blocks water, so the shape it protects is exactly the shape you drew. That makes it useful for anything with a designed outline — a window, a boat hull, the edge of a building — but useless for anything organic.
Cling film works in the opposite way. It does not block water; it traps it in ridges and hollows, and the resulting texture is fractal rather than designed. It is the right tool for rock, foliage, water surfaces and bark, and the wrong tool for anything that needs a controlled silhouette.
The film has to go on wet
Cling film applied to a wash that has lost its sheen will barely register — the paint has already begun to settle and the film cannot move it. It has to go on while the surface is still glossy, which means you have perhaps ninety seconds after the wash is laid on 300 gsm.
Press the film down with the flat of your hand rather than dragging it. Dragging pulls the paint sideways and produces streaks that read as accidents rather than crystal.
Peel speed is a control, not a detail
The single most useful thing about cling film is that the peel rate changes the result. Peeling slowly, over thirty seconds or more, lets the trapped water drain along each ridge and leaves sharp crystalline lines. Peeling fast, in one motion, releases the water all at once and leaves broad, soft blotches.
Practise both on scrap before committing. On a single 20 x 28 cm panel you will get one peel, and the decision is made in the first two seconds.
Cool pigments for a cool surface
Cobalt turquoise, viridian and ultramarine all sit on the cool side and all three granulate to some degree, which means the crystalline texture from the film is reinforced by pigment settling into the ridges. A warm palette under cling film tends to look muddy, because the granulation and the hue pull in different directions.
What matters
- Wax holds a designed outline; cling film makes organic texture. Use each where it fits.
- Cling film must go on while the wash is still glossy — about a 90-second window on 300 gsm.
- Peel slowly for crystalline lines, fast for broad soft blotches.
- Cool, granulating pigments reinforce film texture; warm palettes turn muddy under it.
Handling note — Technique notes only. Wax and cling film are studio consumables — keep them away from heat sources and follow the manufacturer's safety data sheet for all pigments used.