Some paintings feel as if they were lit from within. Francisco de Goya’s portrait of the little Manuel Osorio Manrique de Zuniga (c. 1787–88) at The Met is one of them: a small boy in a blazing red suit, hovering in velvety darkness, flanked by a magpie on a string and three watchful cats. The spell behind that luminous red and soft shadow is our topic today: glazing.
What is glazing?
Glazing is an oil-painting technique in which the artist lays down thin, transparent layers of color over a fully dried underpainting. Light travels through these translucent skins of paint, bounces off the lighter layer beneath, and comes back to your eye carrying a complex, deepened colour. Instead of mixing everything on the palette, Goya stacks colours on the canvas, like coloured glass sheets.
In our Glossary of Art Techniques, you’ll find glazing described as a way to build depth without sacrificing clarity – perfect for fabrics, flesh, and atmospheric shadows.
How Goya builds the boy in red
Look closely at Manuel’s scarlet suit in the Met’s painting. Beneath that rich red probably lies a lighter, warm underlayer – an orangey or pinkish base that sets the overall temperature. Over this, Goya drags multiple transparent red glazes, slightly darker each time. Where folds turn away from the light, he adds yet another, slightly browner glaze, deepening the shadows without ever losing the sense of cloth catching light.
Unlike opaque highlights, these glazes whisper rather than shout. Notice the transition from the illuminated chest to the darker sleeves: there’s no abrupt line, just a slow sinking into shadow, similar in spirit to Leonardo’s sfumato, but achieved with clearer, more saturated colour.
Glazing the darkness
The background is not a flat black wall. Goya likely began with a mid‑tone brown, then floated thin, smoky layers of darker paint over it. In a few places around the boy’s outline, that earlier, warmer tone still peeks through, creating a faint halo that keeps him from sinking into the dark. The cats, too, emerge from this layered dusk – eyes and whiskers picked out opaquely, but their bodies softened by transparent shadow.
If you’d like to train your eye, compare this subtle darkness with the bolder, more sculptural shadows of Caravaggio in our post on chiaroscuro. Where Caravaggio carves figures from darkness, Goya lets them glow inside it.
How to spot glazing in the wild
- Look for depth of colour that seems disproportionate to a thin-looking paint surface.
- Notice areas where shadows feel transparent and warm, rather than dead and opaque.
- Shift your position: in raking light, you’ll often see overlapping, glassy layers on satin sleeves, cheeks, or night skies.
Once you start seeing glazing, you’ll recognise it everywhere – from Goya’s aristocrats to the luminous skies of painters like Turner and the rich flesh tones of Rembrandt. And if you’d like a broader roadmap for noticing such techniques, my guide on how to read a painting is a gentle place to begin.
Happy Tuesday – may the next painting you meet reveal one more hidden layer.