Alla Prima: Finishing an Oil Study in One Sitting

Alla prima means at the first attempt. In the studio it describes an oil painting finished while the paint is still open, usually in one sitting. Nothing waits overnight to dry. You mix, place and adjust in the same wet layer. The method suits a small study: a cup, a piece of fruit, a head in simple light. It asks for early decisions, because there is no dry underpainting to hide a weak start.

Choose a subject you can finish

A board you can cover while you are still interested is kinder than a large canvas that invites fussing. Keep the drawing light. A few lines for the big shapes are enough. A dense pencil map smears into the first paint and dirties the lights. Set out a short row of colours before you begin: a warm and a cool of the main hue, one earth, one strong dark, and white. Premix two or three piles you already know you need, and mix more than looks necessary. Running out halfway, then remixing a slightly different note, is how a simple study turns patchy.

The surface changes the handling. A firm board takes a direct stroke more patiently than a springy canvas. Canvas, Board or Paper walks through that choice without pushing you towards one answer.

Lean first, richer later

Even in one sitting, fat over lean still helps. Early strokes can be slightly thinner, so they grip the ground. Later strokes can be fuller, with less solvent and only a touch of medium if the paint needs to move. Do not turn the colour into soup. Excess oil makes a slippery film that dries slowly and can yellow or wrinkle as it ages. If a passage feels too thick too soon, scrape it with a knife and repaint, rather than stirring more medium in.

A brush with a little spring is more useful here than a mop that holds a puddle. Shapes and sizes are set out in Choosing Your First Brushes. For this kind of study, a medium filbert and a smaller round will do most of the work.

Paint relationships, not souvenirs

Block the large lights and darks first, and compare them as you go. A highlight looks bright only beside a mid-tone you have actually judged. If you describe every detail in wet paint at the start, you will blend it away and repaint it, which tires the surface. Place the shadow as one mass. Place the light family as another. Soften an edge only where the form turns gently, and leave a firmer edge where the form meets space.

This is a different patience from glazing, where you wait and build thin skins of colour. Glazing for Luminous Colour is worth reading so you do not mix the two habits in the same hour. Wet into wet gives unity. Glazing gives a slower kind of light. Choose one for the study in front of you.

Know when the study is done

A finished alla prima piece is not a catalogue of every pip and eyelash. It is a set of relationships that read from across the room: light against dark, warm against cool, one sharper edge among softer ones. Step back after each main passage. If the large note is right, leave it. Scraping a true passage because a small detail annoyed you is the usual way these studies die.

If you use solvent, open a window, keep jars closed when you are not dipping, and do not leave oily rags in a heap. Spread them out to dry, or keep them in a metal tin with the lid on. Wash your hands before you eat. This is ordinary studio care, not a special ritual, and it matters more on a day when you are moving quickly.

Frequently asked questions

How small should the study be? Small enough to cover while your attention still holds. A panel about the size of a sheet of writing paper is plenty for fruit or a single object. You can always work larger once the sequence feels familiar.

Can I go back tomorrow? You can, but it will no longer be a pure one-sitting study. Dry paint will not melt in the same way. If you return, treat the dry layer as an underpainting and keep later paint slightly richer, rather than scrubbing the film with solvent.

Do I need a special medium? No. Paint from the tube, used modestly, is enough. Add medium only when a stroke will not move. More medium is not more skill, and it often makes the surface harder to judge.