Dzan, Mexico – Surrounded by dense jungle and beneath intertwining canopies of towering timber, Luis Could Ku, 49, trudges forward by shoulder-height bushes looking for a uncommon plant. The oppressive 40-degree Celsius (104 Fahrenheit) warmth dulls the senses, and the air, thick with humidity, clings to our pores and skin, inflicting beads of sweat to kind and trickle down.
After scouring the thickets, Could, an Indigenous Maya ceramicist, stumbles upon a shrub comparable in form and texture to others round him, however insists this one is particular. He touches the comfortable, sprawling leaves and tells me it’s wild ch’oj (“indigo plant” in Mayan, anil in Spanish) – or Indigofera suffruticosa – which is a key ingredient to create the revered Maya blue pigment.
“It took years earlier than I discovered it – indigo – and most of the people from Yucatan believed it to be extinct on the peninsula,” Could says with a pensive look, lifting his sombrero made out of interwoven huano palm leaves to wipe his forehead with the again of his hand.
“Chokoj (sizzling)!” I say to him in my restricted command of Mayan as we crouch behind the metre and a half (5-foot) excessive ch’oj bush to flee the relentless, blistering solar. He turns to me with sort eyes and affords me water from his bottle.
“The Yucatan Peninsula goes by its worst drought in many years,” he says. “Let’s relaxation, and I’ll let you know how I recreated Maya blue.”
Maya blue: the color of formality
The color of the enduring dye is akin to a transparent blue sky or the turquoise of the close by Caribbean Sea.
It was used to color pottery, sculptures, murals, jewelry, clothes, altars and, chillingly, the human beings the traditional Maya provided to their gods, to garner favour. In accordance with Spanish Franciscan friar Diego de Landa Calderon – most well-known for his zeal in destroying Maya codices – the Maya painted human beings earlier than forcing them onto an altar and chopping out their beating hearts.
Different victims, forged into the Cenote Chenku or Sacred Properly (cenotes are interconnected, submerged limestone caves) at Chichen Itza, had been equally coated in blue. A transparent sky throughout a drought was an indication for monks to select their subsequent sufferer and paint them in the identical color to sacrifice to the rain deity, Chaak, believed to stay in Xibalba – the Maya underworld – beneath the cenotes. The monks hoped this might convey rain to offer a bountiful harvest for his or her crops.
When American archaeologist Edward Herbert Thompson dredged the Sacred Properly within the early twentieth century, 127 skeletons had been recovered, amongst different objects. He additionally discovered a number of metres of blue silt, which later research recommend was Maya blue that had washed off sacrificed victims and ornaments.
The brilliant azure color can nonetheless be seen among the many ruins on the world-famous archaeological web site of Chichen Itza in Yucatan on murals greater than 800 years outdated.
Solely a handful of blue pigments, akin to lapis lazuli or Egyptian blue, had been created by historical civilisations. Nonetheless, these had been predominantly dyes or minerals, whereas Maya blue required a chemical mixture of natural and inorganic substances. Earlier than artificial variations of blue pigment arrived throughout the Industrial Revolution, the color was exceedingly uncommon and infrequently costlier than gold in Europe. The semiprecious lapis lazuli stone originated within the mountains of Afghanistan and was solely accessible to the rich. But, within the New World, blue pigment was plentiful and thrived.
When the Spanish arrived within the fifteenth century, they exploited Maya blue, together with all of the treasures they stole from Mesoamerican civilisations. The Spanish managed the prized colourant till the late seventeenth to early 18th centuries when artificial substitutes started to reach. Frequent data of Maya blue then disappeared till its rediscovery within the twentieth century.

Technological and creative marvel
In 1931, American archaeologist HE Merwin first discovered “a brand new pigment” on murals inside the Temple of The Warriors at Chichen Itza. It was given the title “Maya blue” just a few years later (1942) by American archaeologists RJ Gettens and GL Stout. Analysis paused throughout World Struggle II, and it was not till the Nineteen Fifties that powder diffraction evaluation revealed the Maya blue pigment had been made by mixing clay, palygorskite (a uncommon fibrous clay) and indigo. In 1993, Mexican historian and chemist Constantino Reyes-Valerio printed a recipe to recreate the color utilizing palygorskite, montmorillonite (a comfortable clay) and indigo leaves.
Fashionable-day scientists worth the mysterious paint as a result of its distinctive resilience to the weather has saved it in near-perfect situation on pre-Columbian murals, artefacts and codices, even a millennium later.
“The pigment has obtained appreciable consideration due to its peculiar nature as an organic-inorganic hybrid materials, its attribute palette, starting from a brilliant turquoise to a darkish greenish blue, and its monumental resistance to assault from acids, alkalis, natural reagents and biodeterioration,” says Maria Luisa Vazquez de Agredos-Pascual, a professor of artwork historical past on the College of Valencia, Spain. She says the aforementioned traits make Maya blue some of the vital technological and creative achievements of the Maya civilization.
Vazquez provides that though Maya blue was recognized as a brand new dye in 1931, it took scientists a very long time to grasp the components, and research are persevering with.
“It was not simple as a result of it was a hybrid pigment, in between natural and inorganic, and detecting natural elements is sophisticated,” she tells me, citing enhancements in chromatography and different scientific evaluation of elements that allowed her and her crew to additional outline the composition of Maya blue. Her analysis decided that the complicated chemical course of of making the pigment resulted in two distinct colourants: indigotin and dehydroindigo.
“Maya blue required an intricate methodology of producing synthesis of varied substances and components, akin to extracting dye from ch’oj earlier than precipitating it onto particular clay referred to as palygorskite,” says Vazquez, who spent two years in Mexico finishing a thesis on optimising electrochemical strategies to establish pre-Hispanic natural colourants, which centered on the indigo plant.
“The indigotin – extracted from indigo – that sticks to the clay stabilises by heating it in an oven, producing a second colourant referred to as dehydroindigo, which makes Maya blue,” she provides.
In accordance with Vazquez, the scientific group advantages enormously from Indigenous peoples who “preserve ancestral data”.
“They’re the guardians of all these traditions relative to their ancestors, and it’s important to help scientific improvement,” she says. “It’s a connection between previous and current. These historical traditions are vital, and I hope they aren’t misplaced.”

‘The Pearl of the South’: The place the journey started
Could was born in Dzan, a village of 6,000 individuals within the western a part of Yucatan about 100 kilometres (62 miles) south of the state capital metropolis, Merida. A lot of the peninsula is flat and pocketed with cenotes fashioned within the aftermath of the cataclysmic meteor that worn out the dinosaurs. But within the municipality of Ticul, which incorporates Dzan, the land rises considerably, giving strategy to the Puuc (“hills” in Maya) area, which has been inhabited since across the seventh century BC.
A number of vital pre-Columbian Maya cities dot the world, such because the World Heritage Web site of Uxmal, an historical Mayan metropolis with stunning Puuc-style structure. The buildings within the ruins have easy, vertical partitions with options akin to columns, elaborate friezes, adorned masks and curved snakes, principally representing the rain god, Chaak, and the feathered serpent deity, Kukulkan, respectively.
The area stays well-known right this moment due to its high-quality pottery and clay sculptures, particularly the city of Ticul, nicknamed “The Pearl of the South”, 5km (3.1 miles) from Dzan. The realm can be a supply of palygorskite – present in caves – which some potters use to grind and blend with different clays to make pottery extra sturdy. Right here, Could reduce his enamel in ceramics as a pupil amongst among the most famed artisans in Mexico and finally started his journey to recreate Maya blue.
“I dreamt of working as my ancestors did with clay and pure pigments,” he says, tapping a finger on his temple. He jogs my memory that, like most individuals in his village, his mom tongue is Maya, and emphasises that he’s proud to work like his forefathers in creating Maya blue.
Could was 17 years outdated when he began sculpting wooden whereas learning Maya Tradition on the Autonomous College of Yucatan, taking inspiration from Maya structure round his area. One in all his passions was capturing faces with distinct Maya options. About 20 years later, he adopted within the footsteps of ceramicists from Ticul and commenced sculpting with clay and discovered from different ceramicists about adorning pottery with natural pigments akin to purple and white.
Nonetheless, he was additionally fascinated to be taught that additionally they used artificial pigments – like blue. On a go to to the Maya ruins in Bonampak, Chiapas, he was captivated by murals painted with a good looking turquoise color. Could found that the sky-blue pigment was held sacred by his ancestors and used throughout rituals. After questioning his colleagues additional, he discovered that the data wanted to create this color in its conventional kind had been misplaced in Yucatan, main him in the direction of a path of rediscovery of historical strategies.

Cracking the blue code
At first, he learn by any outdated Spanish books and manuscripts he may discover and discovered among the science behind recreating Maya blue. Nonetheless, most analysis in regards to the pigment is written in English, which he doesn’t communicate. In 2018, Could began travelling across the state looking for info, together with the Maya title for indigo. About three years later, when talking with village elders, he discovered a clue.
“All data of ch’oj had handed down by generations as a medicinal plant or to whiten garments, however its use in Yucatan as a pigment was, seemingly, misplaced ceaselessly,” he says. Could discovered from an elder that indigo can be left in a bath of water in a single day, then stirred earlier than dirty garments had been swirled within the water for a brief interval to whiten them. Left too lengthy within the combine, they’d flip blue.
“It was a real feeling of ‘kiimak ool’ (happiness)” Could recollects, when the elder revealed that the Mayan title of the indigo plant was “ch’oj”.
This allowed him to collect info from Maya-speaking village elders who may level him in the proper course. It seems the principle ingredient for Maya blue was proper below his nostril.
On the time, Could labored as a major faculty instructor on the Municipal Cultural Centre in Coba, Quintana Roo. He remembered that his college students used shrubs as goalposts for soccer video games within the centre’s again backyard. These shrubs, he realised, had been indigo vegetation.
He requested the caretaker and his shut good friend, Don Justino, to assist him “rescue” the vegetation. Justino, whom Could says makes use of the plant’s leaves for conventional drugs to deal with extreme abdomen ache, was pleased to encompass the shrubs with fencing to guard them.
Could collected and planted the ch’oj seeds, and grew 30 extra shrubs in a close-by plot of land borrowed from the cultural centre. In November 2019, with the assistance of a number of assistants from Coba, he ready his combination of ch’oj and palygorskite clay in a big concrete vat crammed with water. Initially, solely white foam floated to the floor, however after stirring the combination for an hour, the water began to show blue, sparking cheers from the group. Nonetheless, Could noticed the color was nonetheless too pale and wanted additional refinement to attain an genuine Maya blue.
“In Coba, we had managed to extract a blue tint from the plant, nevertheless it was in my lab [a spare room he converted to test his mixtures] again residence in Dzan and utilizing a clay furnace I constructed, just like the normal ones in Ticul utilized by ceramicists, that I discovered the lacking piece,” he says.
“I experimented with numerous pure components. I attempted freezing ch’oj, letting it decay – it took many failed makes an attempt earlier than I lastly cracked the code.” However then the second got here when Could watched the color shift from comfortable blue to vibrant turquoise. He repeated the method and produced the identical hue every time. He had efficiently recreated the elusive color.

Scientific acknowledgement
On January 9, 2023, Could announced on social media that researchers in Italy and Mexico had validated his components. It was the primary time the world had seen Maya blue made with conventional strategies in Yucatan for nearly two centuries.
David Buti, a researcher on the Institute of Heritage Science of the Nationwide Analysis Council in Perugia, Italy, and Rodolfo Palomino Merino, a professor of physics and arithmetic on the Autonomous College of Puebla, Mexico, despatched him PDFs with scientific breakdowns of their analyses. Merino’s work got here by first in August 2022, with a 95 % chance that Could’s components was real. In 2023, Buti’s evaluation verified that it was 100% Maya blue. Each educational establishments confirmed that his samples, which contained palygorskite, calcium carbonate and indigo, brought on an “intercalation between the indigo molecules” – a chemical response – leading to an genuine Maya blue.
“I used to be ecstatic,” Could says. “My ancestors used Maya blue solely in ceremonial practices, and even then, it was in restricted provide. It was the color of the gods, and solely the elite had been permitted to make use of it.”
“As a baby, my father and grandfather taught me that constant exhausting work pays off. By no means giving up and attempting your greatest, even when you don’t succeed, are typical Mayan values,” he provides.
To make Maya blue, Could locations ch’oj leaves in alkaline water – utilizing lime or ash – for twenty-four hours in a concrete vat at his residence. Then the combination is strained and palygorskite clay, collected from close by caves, is positioned on the backside of the vat to soak up the tint. After the ensuing blue clay is baked in an oven at about 250 levels Celsius (480F), it’s then floor right into a positive powder and inserted inside a small flask, able to promote.
In 2021, Could started promoting his Maya blue product commercially to artists and companies. Then, in late 2023, he moved from Coba to Dzan to be nearer to his household and transformed his household milpa (farm) into a bigger ch’oj plantation. A great harvest produces roughly 10kg (22 kilos) of pigment yearly.

Inspiring future generations
Because the late afternoon solar fades, we stroll just a few hundred metres in the direction of Could’s plantation. He factors to a few younger males busily chopping weeds with sharp sickles. He says ch’oj is fragile and suffers from competitors in opposition to different species that develop extra shortly, blocking out daylight and capturing a lot of the rainwater. That’s the reason the employees create area for ch’oj, which might attain greater than two metres excessive, to develop with out obstacle – weeds develop quick within the Yucatan jungle throughout the wet season (June till late October).
College pupil Benjamín Tenreiro Poot, 23, from El Naranjal, Quintana Roo is a type of staff. “Maya blue represents my roots, and I’m delighted to be concerned in a venture that pays tribute to Maya heritage,” he says enthusiastically, taking a break and resting his sickle on his knee.
He was struggling to pay for his different tourism research on the Maya Intercultural College of Quintana Roo when his professor, Guillermo Talavera, steered Could’s venture. Poot beams as he turns in the direction of Could, and says his goal after commencement is to advertise Maya blue. “I believe it is necessary that individuals from everywhere in the world are conscious of this superb pigment and its historical past.”
Could tries to hide his pleasure, saying that his objective is to encourage youthful generations to protect Maya heritage.

Maya cultural pleasure
Once we return to Dzan later within the day, Could stops at a small store to go to a household good friend, Catalina Kankub Hab, whose face he sculpted in 2018 utilizing Maya blue pigment.
I bow my head to enter by a small door, and a girl wearing a huipil (a standard white garment embroidered with vibrant flowery design) approaches us. Could asks to see the sculpture he made for her. She factors above a wardrobe, saying in an apologetic tone that she retains it there out of the attain of her grandchildren. Could brings it down. There’s a robust resemblance between the sculpture and our host.
“It raises my spirit once I take a look at it,” says Catalina Kankub Hab with an endearing smile. “Maya blue is a good looking color, and it’s a fantastic factor that Luis was capable of rediscover it.”
Regardless of his vital discovery, Could’s work stays a solo venture, with out affiliation or funding from nationwide authorities – his solely monetary support was a one-year grant in 2021 from the Santo Domingo Centre of Excellence for Latin American Analysis division of the British Museum in London. He chooses to not patent his recipe as a result of it might require publicising his distinctive components, and folks or firms may use it to create different variations. Nonetheless, Could’s discovery is roofed by the World Mental Property Group (WIPO) and the United Nations Declaration on the Rights of Indigenous Peoples.
“I’d fortunately share my components had I obtained ample help from Mexican authorities,” he says. However then his shoulders sink as he explains that the Mexican authorities used him as propaganda throughout the building of the Maya Practice: a 1,554km-long (966-mile) intercity railway in Mexico that traverses the Yucatan Peninsula.
When Could posted the outcomes of his components on social media, authorities officers coaxed him to participate in a promotional video for the Maya Practice. He additionally attended a photograph shoot with a number of scientists from the Autonomous College of Merida (UNAM) and was promised monetary support to help his venture. Nonetheless, he claims to haven’t obtained any funding from anybody nationally.
“Mexican paperwork makes it so exhausting for individuals like me to succeed, but it takes a bit of my success with each step I take,” says Could.
“I hope individuals perceive that I’ve nurtured this venture with my very own sweat and blood and would like Maya blue to stay within the arms of Indigenous Maya individuals.”
