Prehistoric Art Pigments: Blood, Bone, and Ancient Painting Techniques

Egg tempera is vibrant and crisp, stable, durable, and the colors remain strong. The medium is egg, usually just the yolk, mixed with water to make a creamy paste. Egg dries in minutes, so the artist cannot blend colors on the surface or use impasto thick paint. The artist traces a cartoon, detailed drawn plan, onto the wall and paints water-based pigment straight onto wet plaster, hence the word fresco meaning fresh in Italian. The wall has to be painted in sections. When the plaster dries, the fresco is part of it and will last as long as the plaster. In oil paints, the medium is a vegetable oil that dries naturally when exposed to air. Olive oil is no good; linseed oil is the best and most commonly used. The introduction of oil paint made artists' lives easier, and the new medium had replaced egg tempera by the mid-16th century. Oil paint is easy to work, and the artist can create a variety of finishes.

This lecture introduces three traditional painting mediums used from ancient times through the Renaissance: fresco (painting into wet plaster where the plaster acts as binder and water as medium), encaustic (painting with molten wax where wax serves as both binder and medium), and tempera (using egg yolk as binder). Each medium has distinct characteristics that affect both the visual appearance and the artist's working process, with fresco requiring damp plaster application, encaustic involving heated wax application, and tempera using egg-based binders.

This video introduces three traditional painting media: encaustic (wax mixed with pigment for permanent wood paintings), fresco (pigments applied to wet plaster for wall paintings that become part of the architecture), and tempera (egg yolk mixed with pigment for opaque medieval and Renaissance works on wood panels), each offering unique properties of permanence, luminosity, and artistic expression.

This lecture explores the historical and alchemical principles underlying traditional painting materials, covering two main areas: (1) Painting Mediums - examining the evolution from ancient techniques like encaustic (wax-based), egg tempera, and fresco to the invention of oil painting by Jan van Eyck, with a detailed analysis of the Mischtechnik developed by Ernst Fuchs that combines oil and egg tempera; and (2) Historical Pigments - tracing the development of color from prehistoric ochres through Renaissance ultramarine to modern synthetics, including inorganic minerals (lead white, vermilion, lapis lazuli), organic lakes (madder lake, cochineal), and their planetary-metal correspondences in alchemical symbolism (Saturn-lead, Jupiter-tin, Mars-iron, Venus-copper, Mercury-mercury, Moon-silver, Sun-gold).

Painting is one of the oldest and most fundamental art mediums, with its history spanning from prehistoric cave paintings to modern acrylics. Early cave paintings, such as those at Altamira (12,500 BC), Lascaux (16,000 BC), and Chauvet (32,000 BC), demonstrate that ancient artists possessed sophisticated artistic skills comparable to modern practitioners. The evolution of painting mediums reflects technological progress: encaustic (hot wax and pigment) was used in ancient civilizations, fresco (painting on wet plaster) offered permanence but required specific conditions, tempera (egg yolk and pigment) dominated the Renaissance, oil paint revolutionized the medium in the 15th century, and acrylic emerged in the 1950s as a versatile modern alternative. Each medium offers distinct advantages in terms of drying time, versatility, and durability, with oil paint remaining the most widely used medium for nearly 500 years due to its adaptability and rich color capabilities.

Altamira Cave in Spain was the first art gallery in human history, containing prehistoric paintings of bison, horses, and wild boars dating back thousands of years. The cave earned the nickname 'Cappella Sistina della preistoria' (Sistine Chapel of Prehistory). However, the very visitors who came to admire the art became its greatest threat. The increased humidity and carbon dioxide from thousands of tourists created mold that began destroying the ancient paintings. In 2002, authorities closed the original cave to the public and built a perfect replica in a museum, preserving the original for future generations.

The Lascaux caves in France, discovered in 1940, contain primeval paintings by ancient cave people dating back roughly 17,000 years, depicting various plants and animals. When opened to the public in 1948, the caves received over 1,000 sightseers daily. However, visitors brought carbon dioxide, humidity, and other pollutants that severely damaged the images. Mold grew on the walls due to tourist breath. The caves were closed to the public in 1963, with only restoration workers and archaeologists allowed entry. A replica was constructed for tourists in the early 1980s. Due to further deterioration, the original Lascaux caves are now restricted to preservationists only, demonstrating how human visitation can damage fragile archaeological sites.

The Lascaux Cave in southwestern France contains over 600 prehistoric paintings created more than 17,000 years ago, depicting horses, deer, bison, and mysterious symbols. Discovered accidentally in 1940 by teenagers, this masterpiece of Paleolithic art remained hidden for millennia. However, tourism proved devastating: human breath, humidity, and bacteria began destroying the paintings within years. Fungi grew on the walls and figures faded. In 1963, authorities made the difficult decision to close the cave to the public permanently. Today, only authorized scientists may enter, while the general public must rely on replicas and virtual visits. Lascaux represents one of humanity's most beautiful creations and one of the first sites we learned to destroy without understanding the consequences.

The conservation of prehistoric cave paintings like those at Lascaux faces unique challenges due to the natural environmental conditions of caves, including extremely high humidity (99%), stable temperatures around 12°C, and carbon dioxide levels that can cause dissolution of calcareous rock substrates or precipitation of calcite crystals. These conditions create a fragile biological equilibrium that can be disrupted by human presence, leading to microbial growth such as algae and molds. Effective conservation requires maintaining strict environmental controls, limiting human access, and implementing careful monitoring and treatment protocols to preserve these irreplaceable artworks for future generations.

Lascaux cave faced serious problems from tourism shortly after its discovery in 1940. Within 8 years, the cave was receiving visitors, and numbers continued to increase. Carbon dioxide from visitors' breath and water vapor reacted with the calcite crust covering the paintings, forming soluble calcium bicarbonate that damaged the artwork. In 1960, 'green disease' appeared, caused by excess carbon dioxide, high temperatures, and artificial lighting, allowing algae colonies to grow on the walls. In 1963, 'white disease' developed, and French Culture Minister André Malraux decided to close the cave to the general public.

Hand stencils found in Paleolithic caves represent more than signatures—they constitute symbolic language. In caves like Castillo in Cantabria, uranium-thorium dating reveals some stencils are over 40,800 years old, potentially created by Neanderthals, challenging the prejudice that only Homo sapiens possessed symbolic thought. The technique involved placing palms on rock and blowing pigment from the mouth, mixing ochre, charcoal, or hematite with animal fat or saliva. In Gargas cave, over 200 hand stencils show incomplete fingers—intentionally painted that way, possibly representing gestures or a proto-writing system. If caves were spaces of contact with the sacred, these stencils may have been ritual passages—symbols of transition between the world of the living and spirits. Each blow was an act of affirmation where the individual disappeared and became shadow and symbol.

Maltravieso cave in the city of Cáceres in the Extremadura region of western Spain contains red ochre hand stencils on cave walls. The technique involves placing a hand against the rock and blowing or spraying pigment (usually mixed with water or saliva) around the hand, often through a hollow bone or reed. When the hand is removed, a negative silhouette remains. Some Maltravieso stencils are dated to more than 66,000 years old. The dating method is uranium-thorium analysis of thin calcite crust that formed over the pigment. Calcite calcium carbonate deposited by mineral-rich water dripping inside caves accumulates slowly. By measuring the ratio of uranium to its decay product thorium within the crust, researchers can establish when the crust formed. Because the crust sits on top of the pigment, the crust must be younger, meaning the pigment must be older than the crust covering it. This method gives a minimum age. The implication is sharp: 66,000 years ago, anatomically modern humans are not securely documented in Western Europe. The earliest secure modern human evidence in the region falls roughly 20,000 years later. The likely authors of these stencils, by elimination and by direct association at related sites, are Neanderthals. Red ochre is iron-rich mineral pigment, primarily hematite, ground and mixed with binders. Producing a hand stencil requires planning, pigment preparation, deliberate bodily positioning, and the symbolic intent to leave an enduring mark.

One traces the lines with one's gaze, chest tightening. Who painted these? What did they hope for? What did they fear? One might be surprised to learn that hand stencils created by blowing pigment around an outstretched palm are some of the most common markings found in such caves. Some scholars believe they marked identity—'I was here.' Others think they were part of rituals, symbolic acts connecting people to stone and spirit alike.

Hand stencils are one of the most common forms of prehistoric cave art, created by placing a hand against a wall and covering it with ochre, charcoal, or other pigments. Some hand stencils found in Cosquer cave in France show hands missing fingers. While theories suggest ritualistic mutilation or accidental loss, researchers note that missing fingers only appear in negative imprints (stencils) and never in positive handprints, suggesting artists intentionally curled fingers to create varied shapes for artistic purposes.

Handprints found in caves across Patagonia, Indonesia, Africa, and Southern Europe represent one of humanity's oldest forms of symbolic expression. Positive hand stencils are created by applying pigment directly from the palm onto walls, while negative hand stencils involve blowing pigment around a hand before removing it. The primary pigment used was hematite, a ferric iron oxide mineral known as red ochre, often mixed with animal fat as an adhesive. Beyond their artistic significance, these handprints demonstrate that prehistoric humans possessed theory of mind—the cognitive ability to recognize themselves as distinct beings capable of leaving lasting marks for future generations. This represents a fundamental human characteristic: the desire to communicate across time and establish identity within the broader narrative of human existence.