Manolo Millares (1926–1972)

We authenticate, certify, issue certificates of authenticity (COA), appraise the value, and broker the sale of paintings, collages, works on burlap, drawings, and prints by Manolo Millares.

Manolo Millares was a Spanish artist and one of the most important figures in postwar European avant-garde art, best known for his radical material experimentation and his association with the El Paso group, a key movement in the development of Informalism in Spain. Born in Las Palmas de Gran Canaria in the Canary Islands, Millares initially pursued a self-taught artistic path, deeply influenced by archaeology, ancient cultures, and the prehistoric art of his native islands, particularly the Guanche heritage.

In the late 1940s and early 1950s, Millares began developing a highly distinctive visual language that broke decisively with traditional painting. After moving to Madrid, he co-founded the influential El Paso group in 1957 alongside artists such as Antonio Saura and Rafael Canogar. The group sought to reconnect Spanish art with the international avant-garde while responding to the social and political conditions of postwar Spain.

Millares is most widely recognized for his signature burlap (sackcloth) paintings, in which he abandoned conventional canvas in favor of rough, torn, and heavily stitched jute fabric. These surfaces were often slashed, knotted, patched, and bound with rope or thread, creating dense, visceral compositions that blur the boundary between painting and object. He frequently incorporated black, white, and earthy pigments, emphasizing contrast, abrasion, and raw material presence over traditional pictorial representation.

His works are deeply associated with themes of trauma, mortality, and historical memory. The fragmented, bandage-like surfaces of his burlap paintings have often been interpreted as evoking wounded bodies, archaeological remains, or ritual objects. Rather than depicting narrative scenes, Millares created works that function as physical traces of destruction and reconstruction, where material deterioration becomes a central expressive force.

Millares was strongly influenced by both prehistoric imagery and modern existential thought. He often referenced ancient funerary practices and cave art, while also engaging with the postwar European discourse on human suffering and the fragility of civilization. His work reflects a tension between destruction and creation, order and chaos, materiality and symbolism.

Throughout his career, Millares gained international recognition, exhibiting widely across Europe and contributing significantly to the development of Informalism and Art Brut–influenced practices. His work played a crucial role in redefining painting as a physical, material act rather than a purely visual or representational one.

Today, Manolo Millares is regarded as a pioneering figure of postwar abstraction whose innovative use of materials and emotionally charged surfaces profoundly influenced the evolution of contemporary painting and assemblage art in the second half of the 20th century.

AI-Powered Research and Human Authentication of Manolo Millares’s Works

Authenticating and valuing a work attributed to Manolo Millares requires a high level of specialized expertise in postwar Spanish abstraction, Informalist painting, and material-based assemblage practices. Art Experts provides a comprehensive and methodical approach to the examination of paintings, burlap works, mixed-media constructions, and drawings attributed to Millares. Our process begins with detailed comparative visual and material analysis, assessing composition, structure, technique, and scale against securely documented works from the artist’s career.

Particular attention is given to Millares’ distinctive use of rough burlap (sackcloth) as a primary support, as well as his characteristic interventions including tearing, stitching, knotting, patching, and layering. We carefully evaluate the integration of these physical alterations with paint application, pigment density, and surface construction, all of which are central to his expressive language. The material condition of the support, including wear, repair, and aging patterns, is also examined in relation to authenticated works.

This analysis is supported by extensive provenance research. We review ownership history, exhibition records, gallery documentation, archival materials, publications, correspondence, and catalogue raisonnés associated with Manolo Millares and the El Paso group. Given the experimental nature of his practice and the uniqueness of each work’s material construction, early documentation and exhibition history are especially important in establishing authenticity.

Where appropriate, scientific and technical analysis may also be employed. Methods such as textile and fiber analysis, pigment and binder identification, surface stratigraphy, stitching and repair pattern examination, infrared and ultraviolet imaging, and microscopic inspection can help determine whether materials and construction techniques are consistent with Millares’ known working methods.

AI is used as a supportive research tool to assist our specialists in organizing and processing information, including verifying historical data, cross-referencing events, confirming dates, analyzing publications, extracting structured datasets, generating comparative metrics, and assisting in statistical modeling. However, AI does not possess judgment, material understanding, or the ability to interpret artistic intent, emotional content, or aesthetic significance. It cannot determine authenticity in a meaningful scholarly sense. Furthermore, artistic creation does not contain a fixed, universally identifiable signature comparable to a fingerprint or DNA, and therefore cannot be reduced to algorithmic verification.

For these reasons, AI cannot authenticate artworks. All final determinations, opinions, and certifications are made exclusively by experienced human experts with deep knowledge of Manolo Millares’ material-based practice and postwar Spanish avant-garde art. AI serves only as a practical analytical tool within a broader expert-driven process.

Clients receive a detailed and structured report of findings outlining all research, observations, and conclusions. Where appropriate, we issue a Certificate of Authenticity (COA). We also provide professional appraisals for insurance, resale, estate planning, taxation, donation, and legal purposes, ensuring a complete and informed understanding of both the market value and artistic significance of works attributed to Manolo Millares.

Reviewing Rejected Manolo Millares Art

Auction houses and major galleries are often highly selective when evaluating works attributed to Manolo Millares, particularly when documentation, provenance, or prior scholarly attribution is incomplete or uncertain. In many cases, paintings, collages, or burlap works may be declined without a full technical or material review. However, such decisions do not necessarily represent definitive conclusions regarding authenticity. As with any important artistic, historical, or financial matter, obtaining an independent second opinion can be essential.

Art Experts provides a thorough re-examination service for paintings, burlap works, mixed-media constructions, and drawings attributed to Manolo Millares. Our specialists carefully reassess each work through detailed analysis of composition, structure, surface treatment, and material construction, with particular attention to Millares’ distinctive use of torn, stitched, and heavily worked sackcloth supports. We evaluate how paint, fabric, thread, and repair elements interact within the work, and whether these material processes are consistent with securely documented examples.

We also conduct extensive provenance research, reviewing ownership history, exhibition records, gallery documentation, archival materials, publications, correspondence, and catalogue raisonnés associated with Manolo Millares and the El Paso group. Given the experimental and materially unique nature of his practice, documentation of early exhibition history and collection records is often crucial in establishing authenticity.

Where appropriate, we also incorporate technical and scientific analysis, including textile and fiber examination, pigment and binder identification, stitching and repair pattern analysis, surface stratigraphy, and imaging techniques such as infrared and ultraviolet scanning. These methods help determine whether materials and construction methods are consistent with Millares’ known working processes.

Through this comprehensive process of research, technical study, and professional evaluation, we provide the documentation and expert insight necessary for artworks to be reconsidered by leading auction houses, galleries, and collectors. Our objective is to ensure that works of potential historical and artistic significance receive the informed and rigorous assessment they deserve.

If you own a painting, burlap work, collage, or drawing attributed to Manolo Millares, we would be pleased to review it. Please send us photographs and any available documentation or contact us at [email protected]. In most cases, you will receive a response within 24 hours.