Tempera is a painting medium in which pigments are bound with an aqueous emulsion, with egg tempera being the best known historical form. In strict technical usage, tempera refers to an emulsion based binder system rather than simply any water based paint. Egg tempera commonly uses egg yolk as a binder, sometimes modified with water, vinegar or other ingredients according to historical recipes.
The resulting paint dries relatively quickly into a durable film and is normally applied in thin layers rather than the thick, slow drying masses associated with Oil Painting. Tempera can produce precise lines, luminous colour, finely controlled modelling and a distinctive matte to satin surface. It has been used on wood panels, prepared grounds and other supports, particularly in European medieval and Renaissance painting traditions.
The word Tempera is related to the concept of tempering or mixing, reflecting the preparation of pigment with a binding medium. Tempera techniques existed in multiple cultures before the European Renaissance, and the term can describe several emulsion systems rather than one universally fixed recipe. Egg tempera became particularly prominent in European panel painting before the widespread dominance of oil techniques.
Medieval icons and religious panels demonstrate sophisticated tempera traditions, while artists developed highly controlled methods of building form through repeated strokes and layers. As Oil Painting became increasingly important in European art, tempera remained in use for specific purposes and later experienced renewed interest among artists seeking its precise handling and durable surface. Modern commercial tempera paints may differ substantially from traditional egg tempera and should not automatically be treated as technically equivalent.
Egg Tempera requires careful preparation because the binder's properties influence both application and durability. Egg yolk contains proteins, lipids and other components that form a binding emulsion as the water evaporates and the organic material dries and cures. Pigments are usually ground and mixed into small quantities of binder rather than stored in large ready made quantities for extended periods. The paint dries rapidly, which encourages the artist to work in small strokes and layers.
Because the binder is relatively lean and the paint film is thin, large continuous wet blends are difficult compared with Oil Painting. This limitation contributes to the characteristic appearance of traditional egg tempera, where form can be constructed through hatching, cross hatching, stippling and many overlapping strokes rather than prolonged wet blending.
Traditional Tempera is strongly associated with carefully prepared supports. Wooden panels may be coated with layers of gesso, traditionally made from animal glue and a mineral filler, then smoothed to produce a hard, absorbent surface. The preparation creates a stable ground that supports the thin paint layers and allows precise marks. Artists historically transferred drawings onto the prepared panel before applying colour, sometimes using detailed underdrawing and controlled development of forms.
Gold leaf was also used extensively with tempera in religious and devotional painting, although gilding is technically a separate process that can be incorporated into the overall artwork. The relationship between ground, binder, pigment and environmental conditions is important because traditional panels can respond to changes in humidity and temperature over long periods.
Tempera techniques are often characterised by precision and incremental modelling. Artists can establish a drawing, lay in broad colour fields and progressively develop form through increasingly refined strokes. Because individual layers dry rapidly, later marks can be placed over earlier ones without the prolonged waiting periods required by oil. Transparent or semi transparent layers can create optical complexity, while opaque passages establish solid forms. The technique rewards careful control of brush pressure, pigment consistency and stroke direction. Artists can use directional hatching to describe curvature, making the brushwork itself contribute to the perception of volume. The resulting surface can remain highly detailed and materially distinctive, especially when viewed closely.
Tempera is frequently confused with Oil Painting and Gouache because all three can produce opaque coloured images, but their binders and handling are different. Egg Tempera uses an emulsion based on egg, while Oil Painting uses drying oils and generally remains workable longer. Traditional tempera normally dries rapidly and is applied in relatively thin layers, while Gouache is a water based opaque medium designed for more flexible and often more easily reactivated applications. Commercial tempera paints marketed for education can use synthetic binders and may be designed for classroom use rather than archival fine art. Consequently, the word Tempera must be interpreted according to historical and commercial context.
Common misconceptions include the belief that Tempera is simply an old version of Oil Painting or that its quick drying behaviour makes detailed modelling impossible. In reality, traditional tempera supports highly detailed modelling through repeated layers and controlled strokes. Another misconception is that every painting called tempera uses egg. Historical and modern formulations vary, so technical identification may require examination of the binder rather than the label alone.
Egg tempera also does not necessarily produce a completely flat appearance; the final surface can develop subtle luminosity depending on pigment, ground, layering and finishing. Artists must nevertheless accept its different working rhythm. Attempting to force egg tempera to behave like slow drying oil paint can produce unnecessary technical problems.
Tempera remains important historically and technically because it demonstrates how an aqueous emulsion can produce a durable, highly controlled painting surface. Its rapid drying, precise application and compatibility with carefully prepared grounds made it particularly effective for panel painting and detailed imagery. Conservation research has also made Tempera valuable for understanding historical painting technologies, material ageing and workshop practices. Modern artists sometimes return to egg tempera because its disciplined working method encourages close attention to drawing, layering and surface. Its limitations include demanding preparation, relatively short working time and restricted wet blending, while its strengths include precise control, fine detail and a distinctive optical quality. Tempera therefore represents both a historically important medium and a technically specialised contemporary practice.
