Why Simple Washes Do So Much Work

A sky wash is usually the first thing to touch your paper, and everything that follows is judged against it. If the first wash is fresh, clean and full of light, the rest of the painting has room to breathe. If it has been scrubbed, over-blended and fussed over, you will spend the next hour trying to rescue the mood.

Here is the reassuring part: skies and distant hills want exactly the same thing. Soft, simple shapes of colour, laid down with confidence and then left alone. Distance removes detail. Atmosphere softens edges. What looks like a sophisticated effect is almost always one well-judged wash allowed to dry undisturbed.

Choose Colours That Suit Our Changeable Light

Before mixing anything, think about what the sky is actually doing. A bright, breezy afternoon needs a cooler mix than a damp, grey morning with low cloud over the hills. A small, reliable palette will carry you through both.

• Cool, clear blue: French ultramarine with the tiniest touch of burnt sienna to knock back the purple.
• Silver-grey weather: cobalt blue or cerulean with a little raw umber. Keep it pale — grey skies are far lighter than beginners expect.
• Warm horizon haze: a whisper of permanent rose or cadmium orange dropped into the base mix near the horizon line.
• Distant hills: the same sky mix, plus a fraction more ultramarine and umber. Never a completely different colour.

The trick that makes distance convincing is repetition. If the hills are mixed from the sky colours, the whole scene belongs to one moment in time. Reserve your strongest, most saturated mixtures for the foreground.

Set Up Properly Before You Mix a Single Colour

Half the battle is won before the brush touches the paper. A soft, even wash needs a surface that stays wet for a few minutes, and a brush that holds plenty of water without dumping it in one go.

• Paper: 300gsm (140lb) cotton paper, taped or stapled to a board so it will not buckle.
• Angle: tilt the board to roughly 15–25 degrees so gravity helps the wash flow downwards evenly.
• Brushes: a 2.5cm (1in) squirrel mop or soft hake for skies; a smaller round for the hill shapes.
• Water: two pots — one clean for wetting the paper, one for rinsing. Muddiness usually comes from a dirty rinse pot.
• Pigment: mix generous puddles. A weak, stingy mix forces you to go back over the wash, which is what ruins it.

The Graded Sky Wash, Step by Step

Work flat and quickly, and resist the urge to keep going back. The whole operation should take under two minutes.

• Step one: wet the sky area with clean water using even, horizontal strokes. Let the sheen settle for a moment so the surface is damp rather than puddled.
• Step two: load your mop with strong colour and lay a horizontal band across the top of the paper. Do not scrub — one confident stroke.
• Step three: rinse the brush, wipe it once, then pull the band downwards across the paper, letting each stroke overlap the last and pick up the pigment above.
• Step four: add a little clean water to the mix as you approach the horizon, so the colour fades almost to nothing.
• Step five: stop. Put the brush down and let it dry.

If you want clouds, wait until the sheen has nearly gone, then lift soft shapes with a clean, damp brush or a tissue. Timing matters more than technique here — too early and the edges flood, too late and they turn hard.

Distant Hills: Soft Edges and Low Contrast

Hills on the far horizon should look as though they are dissolving into the sky. Mix a slightly stronger version of your sky colour, then paint the hill shape with its top edge just touching the still-damp sky wash. The pigment will feather upwards on its own.

Keep the hill shape simple — two or three gentle humps, no fiddly bumps. Leave a sliver of unpainted paper between overlapping ridges to suggest mist, and avoid putting any dark tone in a distant hill. If the far hills are as dark as the trees in front of them, the illusion of depth collapses instantly.

When It Goes Wrong: Three Quick Rescues

• Streaky, broken wash: the paper was too dry, or your mix was too thin. Let it dry and glaze a very weak layer of the same colour over the top. Glazing forgives almost anything.
• Blossoms and backruns: these form when a wet drop lands on a damp-but-not-wet surface. Turn them into interest — a distant copse, a cloud break — or lift them while damp with a clean brush.
• Muddy colour: usually too many pigments in one puddle. Limit yourself to two colours and keep a clean rinse pot close at hand.

Above all, keep painting little skies. Ten small washes on scrap paper will teach you more than one large, anxious painting. Fill a sketchbook page with squares of varying blue and grey before you attempt a full landscape — and keep notes in the margin so you remember which mixes sang and which fell flat.