Old Master's Secret - Glazing
Before and After Glazing – An Old Master's Secret
One of the most fascinating stages of an oil painting is glazing.
These two images show the painting before and after several transparent glaze layers. At first glance, the difference may seem subtle, but glazing transforms a painting in ways that are difficult to achieve by simply mixing colours opaquely.
The technique has a long and distinguished history. During the Renaissance, many of the great masters built their paintings in stages, allowing each layer to dry before applying thin, transparent films of colour over the surface. Artists such as Jan van Eyck, Titian, and later Rembrandt used glazing to create extraordinary depth, luminosity, and richness that became hallmarks of classical oil painting.
The science behind it is just as fascinating as the history.
Opaque paint reflects most of the light directly from its surface. Transparent pigments behave differently. Light passes through the transparent glaze, reflects from the lighter paint layers beneath, and then travels back through the coloured glaze before reaching our eyes. This creates an optical effect that makes colours appear deeper, richer, and almost as though they are glowing from within.
It isn't simply a darker layer of paint. It is light being coloured twice.
This is one of the unique qualities that makes oil painting unlike any other medium.
Today, this traditional approach is surprisingly uncommon. Modern painting often emphasizes direct methods such as alla prima or wet-on-wet painting, where the work is completed in a single session or only a few sittings. Glazing, by contrast, demands patience. Each layer must dry before the next can be applied, making it a slow and deliberate process. While many contemporary artists still use glazes selectively, few build paintings with multiple glazing stages in the way earlier masters often did.
One final note: photographs simply cannot reproduce the full effect of glazing. Cameras flatten much of the subtle interaction of light within the transparent paint layers. In person, the colours often appear noticeably richer, deeper, and more luminous than they do on a screen.
It's one of those aspects of traditional oil painting that has to be experienced firsthand.

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