Difference between tempera and watercolor: A technical comparison

difference between tempera and watercolor

The primary difference lies in their binders and visual effects. Tempera uses a glutinous binder like egg yolk to create a matte, saturated, and permanent finish. Watercolor uses a water-based solution with synthetic binders, focusing on transparency and the ability to let the paper shine through the pigment.

Tempera is a disciplined, ancient medium used for centuries to achieve a "disciplined glow." It is often applied to wood panels to create luminous, sacred imagery. In contrast, watercolor is an aqueous medium that relies on the movement of water to create soft, atmospheric washes and delicate gradients.

Key distinctions include:

• Tempera: High color saturation, matte finish, and water-resistant once dry.
• Watercolor: High transparency, lightfast professional pigments, and controlled by water flow.

What is the difference between tempera and watercolor?

Tempera is a fast-drying, permanent medium made by mixing pigments with a water-soluble binder, typically egg yolk. Watercolor is a method where pigments are suspended in a water-based solution, often using synthetic binders that make the medium almost entirely vegan-friendly and highly transparent.

Historically, these mediums served very different purposes. Egg tempera was the primary medium for European panel painting until the 15th century, used by masters to capture divine light. Watercolor, while having ancient roots potentially reaching back to the Paleolithic Age, became a mature, independent medium later, famously utilized by artists like J.M.W. Turner.

When comparing the two, consider these functional traits:

• Tempera: Best for precise, structured, and permanent works on absorbent surfaces.
• Watercolor: Best for capturing ephemeral, light-filled moments like mist or petals.

How do the chemical binders and compositions differ?

Tempera relies on a thick, glutinous binder, most commonly egg yolk, which makes the paint water-resistant but not waterproof. Watercolor uses a water-based solvent and typically employs gum arabic or synthetic binders, resulting in a medium that is highly soluble and designed to flow with water.

The composition of the pigment itself varies significantly between the two. Professional watercolors are designed to be lightfast and contain roughly 20-50% pure pigment. Tempera compositions can vary; while egg tempera is traditional, other versions include casein (milk protein) or poster paint, which uses binders like cornstarch or gum arabic.

Binder comparison:

• Egg Tempera: Uses egg yolk; non-vegan; creates a hard, matte surface.
• Watercolor: Uses synthetic or gum binders; vegan-friendly; allows for high transparency.

How do drying times and opacity levels compare?

Tempera dries almost instantly, which requires the artist to work with speed and precision. It can be applied in thin, semi-opaque, or transparent layers but generally produces a more opaque, jewel-like clarity. Watercolor dries as the water evaporates, offering a much higher degree of transparency.

Because tempera dries so quickly, it cannot be blended easily on the surface like oil paint. Instead, artists use meticulous cross-hatching to build up tone. Watercolor achieves its luminosity through the white of the paper visible between scattered pigment particles, allowing for a build-up of light through layering.

Drying and light properties:

• Tempera: Fast-drying; matte finish; high saturation; semi-opaque to opaque.
• Watercolor: Evaporative drying; transparent; relies on paper for illumination.

Which medium is better for layering and fine detail?

Madonna with Child and Two Angels (Crevole Madonna)

Madonna with Child and Two Angels (Crevole Madonna), Duccio di Buoninsegna

Tempera is superior for fine, meticulous detail and structured precision due to its fast-drying nature and ability to hold sharp edges. Watercolor is better for layering translucent washes to create depth, light, and atmospheric effects that require the fluid movement of water.

The Crevole Madonna (1283) by Duccio di Buinsegna, located in the Museo dell'Opera del Duomo, showcases the power of tempera. This Sienese Gothic masterpiece uses the technique on wood panel to achieve brilliant color and fine, luminous detail. Watercolor, conversely, is the medium of the "optical moment," perfect for capturing the soft blush of a petal or a hazy mountain silhouette.

Application strengths:

• Fine Detail: Tempera is ideal for precise, permanent, and highly detailed iconography.
• Layering Light: Watercolor is ideal for building translucent, ethereal, and atmospheric layers.