Jackson Pollock’s Number 1A, 1948 has long been recognized as one of the artist’s most famous works, known for its distinctive and vibrant blue. For 77 years, the exact nature of the paint’s color remained a mystery, despite multiple attempts to identify it. Recent research, highlighted by Science Alert, has brought new insights into this enigma.
A team led by chemist Alexander Heyer from Stanford University used advanced scientific methods to finally pinpoint the pigment used in Pollock’s masterpiece. This breakthrough could reshape our understanding of Pollock’s creative process and the materials he employed in his groundbreaking artwork.
The 77-Year Mystery of Pollock’s Blue Revealed
For decades, one of Jackson Pollock’s most iconic paintings, Number 1A, 1948, kept a vibrant secret—its electric turquoise blue. The color, striking in its purity, had always puzzled experts and viewers alike. Now, after 77 years, a team of scientists, led by chemist Alexander Heyer from Stanford University, may have finally solved this colorful mystery.
‘Blue Poles’ by Jackson Pollock. Credit: swarezart.com
Pollock’s work, often chaotic and rebellious, broke every rule in the art world. He abandoned the traditional easel and instead laid his canvas flat on the floor, allowing paint to drip, splatter, and squirt in a way that reflected his physical and emotional engagement with his medium. This technique, known as “drip painting,” resulted in the birth of Number 1A, 1948, one of his defining pieces. But the mystery of its glowing blue hue remained unsolved for almost a century.
The Mystery Paint: What Was That Blue?
Pollock’s palette was eclectic. His paintings blended oil paints with industrial enamel house paints. In Number 1A, the black and white streaks of paint contrast with bright splashes of color—primarily red, yellow, and that mysterious blue. While art historians have long known about the pigments Pollock used for the red and yellow, the blue remained an enigma.
Manganese blue. Credit: Winston & Newton
For years, chemists attempted to identify the vibrant shade, but previous methods failed to yield a definitive answer. The first attempts at identifying the pigment using Raman spectroscopy were unsuccessful, mainly because the fluorescence from the oil-based binder Pollock used interfered with the results. Raman spectroscopy is a technique where a laser is used to detect the unique vibrations of molecules, helping scientists identify the material.
The breakthrough came when researchers carefully scraped paint from the blue streaks of the painting and analyzed them in the lab using this method, but this time with a lower energy line of 785 nm, a critical adjustment that allowed the team to compare the scrapings with the known Raman spectra for manganese blue.
The Culprit: Manganese Blue
The striking hue of the blue paint in Pollock’s Number 1A, 1948 has now been traced back to a pigment known as manganese blue, or barium manganate sulfate. Developed in 1907 and introduced to the market in the 1930s, this synthetic pigment was a relatively new discovery when Pollock began his work. It gave the artist a bright, clean blue that stood out among his other bold colors.
Manganese blue was a rare gem in the art world, prized for its unique ability to create an incredibly pure color. Unlike other blues, such as ultramarine or cobalt, it could filter non-blue light to produce a vivid, almost electric shade.
Manganese blue accomplishes a difficult task: creating clean hues from colors in the center of the visible spectrum – the authors write.
The team’s analysis revealed that two distinct electronic transition bands were responsible for this pigment’s unique ability to create such a pure hue. This made the blue in Pollock’s painting shine with remarkable intensity.
However, as the research team discovered, this beautiful pigment came with a dark side. Manganese blue was eventually banned due to its toxicity concerns, both for artists and the environment. Its powerful properties made it a favorite, but at a great cost.
The researchers also emphasized that while blue pigments like ultramarine, phthalocyanine blue, cobalt blue, and Prussian blue had been identified in Pollock’s body of work, this palette now officially includes manganese blue, marking an important discovery in Pollock’s use of color.