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Tempera Grassa

A hybrid egg-and-oil emulsion paint that combines the matte, luminous quickness of egg tempera with the flexibility and depth of oil.

What it actually is

Tempera grassa—literally "fat tempera"—emulsifies egg yolk with linseed, walnut, or poppy oil, often stabilized with dammar resin or gum arabic. The result is a paint that dries fast like tempera, stays flexible like oil, and retains a matte, fresco-like optical quality that pure oil cannot produce. Stuck reached for it in Munich for the archival luminosity of his mythological scenes. Mucha used it deliberately on the twenty-foot Slav Epic canvases because the flexibility let the paintings be scrolled for transport without cracking. Böcklin designed his own emulsion recipes and had a Florentine pharmacy produce the paints to specification. The medium is the material signature of the turn-of-the-century Central European project to recover a pre-oil technical sophistication.

Painters who used this
Franz von Stuck1863–1928 · Germany
The Munich "Prince of Art" who designed every element of the Villa Stuck as a total work of art, painted his mythological subjects in a custom tempera-grassa emulsion, and designed the frame for every painting as architectural integration rather than ornament.
Alphonse Mucha1860–1939 · Czechia
The Czech Art Nouveau master who spent eighteen years painting The Slav Epic—twenty canvases up to six meters wide—in a Bohemian castle, in a tempera-grassa medium he chose specifically because it stayed flexible enough that the finished paintings could be rolled and transported without cracking.
Arnold Böcklin1827–1901 · Switzerland
The Swiss Symbolist who refused to paint outdoors—insisting the artist should observe nature intensely but paint only from memory, in a custom emulsion of glue, egg, oil, and resin that he commissioned a Florentine pharmacy to produce to his specification.
Related techniques
Lead-White Highlights
Reliance on lead white (flake white) for luminous, long-lasting highlights, especially on skin and metal.
Scumbling for Atmosphere
Thin, dry applications of lighter paint over a darker one to generate dust, smoke, haze, or distance.
Limited Palette
Working from a deliberately restricted set of pigments—four or five colors—on the belief that constraint sharpens color decisions.
Tinted Ground
A canvas preparation that is deliberately not white—a brownish, grayish, or warm-toned priming layer baked into the support before painting begins.
Buon Fresco
Painting into wet plaster so the pigment fuses with the wall as it dries—the dominant monumental wall technique from the Renaissance through the eighteenth century.
No-Medium Direct Oil
Painting in pure oil color straight from the tube, without linseed, turpentine, or glaze medium—a refusal of the thin-layered academic approach.