Glazing — Art, 14–17
A transparent layer can change a painting without covering everything beneath it. Glazing is a controlled way to deepen colour, join areas and make light seem to pass through the paint.
Colour through colour
A glaze is a thin, transparent or partly transparent layer of paint placed over a dry layer. The lower colour still shows, so your eye mixes the two rather than seeing a single opaque patch. Several glazes can create depth and subtle shifts that would be difficult to get by mixing all the paint on a palette.
Why paint in layers
Painters needed a way to adjust a colour after it had dried without destroying the shapes and brushwork below. An opaque repaint hides the earlier decisions; a glaze changes them while keeping some evidence. The problem it solves is control over a complex surface: colour can be corrected gradually instead of guessed perfectly at the start.
Turning yellow into green
Paint a small square bright yellow and let it dry completely. Mix a transparent blue glaze with plenty of medium or water, then brush one thin layer over half the square. Let it dry before adding a second layer if needed. The glazed half reads as green because light travels through blue, meets yellow below, and returns to your eye with both colours involved.
The trap: too much paint
It is tempting to use a glaze like ordinary paint and spread a thick, strong layer at once. That feels efficient because the colour changes immediately, but the layer becomes cloudy and hides the painting below. Use a small test patch, keep the layer thin, and wait for it to dry: a glaze often looks different when wet.
Where it appears
Glazing appears in oil painting, acrylic painting and some watercolour methods. A portrait painter might warm a cheek with a transparent red layer, while a landscape painter might deepen a sky without losing the brushwork below. The same idea appears in digital art when a low-opacity colour layer changes an image underneath.
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