Copper Resinate Verdigris

Description

Copper Resinate is a historic transparent green resin glaze made by combining copper salts with natural venetian resin, dissolved in natural turpentine. It produces a brilliant, jewel-like green with a deep translucent color, ranging from warm yellow-green glazes to rich emerald-green passages depending on concentration, background, and layer thickness. Unlike opaque copper greens such as malachite or green verditer, Copper Resinate is valued for its glowing transparency and ability to create saturated green glazes over lighter underlayers.

Copper Resinate has a vivid, luminous glow that can be especially beautiful in oil painting. It was often used to intensify foliage, green draperies, landscape passages, and decorative details. Because of its transparency, it can create remarkable depth when layered over yellow, lead-tin yellow, verdigris, azurite mixtures, or pale underpaint. It gives a deep, varnish-like green that feels very different from modern chromium oxide green, viridian, or synthetic organic greens.

However, Copper Resinate is also one of the more chemically unstable historical green materials. It is prone to discoloration, browning, and loss of brilliance over time, especially when exposed to light, moisture, acidic conditions, or reactive paint systems. Many historical copper resinate passages have darkened from bright green to olive, brown, or nearly black. For this reason, it should be understood as a historically important but delicate material, best suited for careful glazing, reconstruction, conservation reference, and artists who are intentionally working with traditional materials.

History

Copper Resinate was widely used in European painting from the late medieval period through the Renaissance and into the early modern period. It developed from the broader tradition of copper-based green pigments and glazes, including verdigris, malachite, green verditer, and other copper compounds. Artists valued it because it could produce a transparent green intensity that opaque mineral pigments could not easily achieve.

During the Renaissance, Copper Resinate became especially important in oil painting, where transparent glazes were used to create depth, luminosity, and saturated color. It was frequently used for foliage, landscapes, green fabrics, architectural details, and decorative passages. The pigment was often applied over yellow or green underlayers to produce a glowing optical green. This made it particularly useful in layered painting systems where the final color depended on the interaction between the glaze and the paint beneath it.

Copper Resinate is closely associated with the technical vocabulary of early oil painting. Artists and workshops used resinous copper greens to achieve jewel-like effects, but they also inherited the material’s instability. Historical paintings often show darkened or altered green areas where copper resinate was once much brighter. These changes have become an important subject in conservation science, helping researchers understand how Renaissance and Baroque paintings originally appeared.

In the pictured artwork “Bacchus and Ariadne” by Titian, copper-resinate and verdigris are used throughout the foliage. Like verdigris, Copper Resinate belongs to the family of brilliant but reactive copper greens that helped artists create luminous green effects before the invention of modern stable green pigments such as viridian and chromium oxide green.

By the 18th and 19th centuries, Copper Resinate and related unstable copper greens were gradually replaced by newer pigments that offered greater permanence and easier handling. Today, Copper Resinate remains important for historical reconstruction, conservation study, icon painting, and artists interested in the luminous but fragile green effects of early oil painting.

Pigment Information

Pigment Type: Synthetic Organic-Metallic / Copper Resin Pigment-Lake

Chemical Composition: Copper salts of resin acids, commonly copper abietate and related copper resinates

Suitable Mediums: Oil, Oil Glazes, Varnish-Based Painting

Lightfastness: Acceptable to Poor; prone to browning, darkening, and chemical alteration over time

Opacity: Transparent

Other Names: Copper Resinate, Copper Green Resinate, Green Resinate, Copper Resin Green, Resinate of Copper, Resin Green

Color Index Code: NA

Image: “Bacchus and Ariadne” by Titian from the National Gallery