28 March 2025 The Future is the Product of the Past

Archaeologists discovered the secret ingredient that made Mayan plaster durable

Ancient Mayan masons had their own secrets for making lime plasters, mortars, and plasters, which they used to build their magnificent structures, many of which still stand today.

A team of mineralogists and geologists at the University of Granada has discovered the secret ingredient that made Mayan plaster so durable.

The team has analyzed samples of Maya plasters from Honduras and confirmed that the Maya added plant extracts to improve the plasters’ performance, according to a new paper published in the journal Science Advances.

The team collaborated with local Maya-descended masons in Copán, Honduras, which was a major Maya center prior to Spanish colonization of Central America, to learn how the plaster was made. The approach involves adding the sap from the bark of local tree species, Chukum and Jiote when the lime – the umbrella term for calcium oxides rather than the delicious fruit – is mixed with water, a process called slaking.

Maya plasters from Copan archaeological site (Honduras). (A) General view of Structure 10L-16 (Late Classic building dedicated in 776 CE) (22). Within this structure is located substructure “Rosalila” (540 to 655 CE), the best example of a complete Classic temple in the Maya area, whose surface is decorated with pinkish lime plaster and stucco masks (B). Samples MCopan-10 and MCopan-11 were collected from the latter location, shown (marked with a red star) in the site map (C). Samples MCopan-1 (D) and MCopan-2 (E) corresponding to coarse lime plasters from the interior wall of the central room of Structure 12, ca. 700 CE [blue star in (C)]. Samples MCopan-3 (F) and MCopan-4 (G) corresponding to a fine two-layer plaster (“stucco”) floor from the mid-Classic (500 to 700 CE) collected in tunnel 74 at Structure 10L-16. (C) adapted from (22) with permission from Springer Nature. Photo: Science Advances (2023). DOI: 10.1126/sciadv.adf6138
Maya plasters from Copan archaeological site (Honduras). (A) General view of Structure 10L-16 (Late Classic building dedicated in 776 CE) (22). Within this structure is located substructure “Rosalila” (540 to 655 CE), the best example of a complete Classic temple in the Maya area, whose surface is decorated with pinkish lime plaster and stucco masks (B). Samples MCopan-10 and MCopan-11 were collected from the latter location, shown (marked with a red star) in the site map (C). Samples MCopan-1 (D) and MCopan-2 (E) corresponding to coarse lime plasters from the interior wall of the central room of Structure 12, ca. 700 CE [blue star in (C)]. Samples MCopan-3 (F) and MCopan-4 (G) corresponding to a fine two-layer plaster (“stucco”) floor from the mid-Classic (500 to 700 CE) collected in tunnel 74 at Structure 10L-16. (C) adapted from (22) with permission from Springer Nature. Photo: Science Advances (2023). DOI: 10.1126/sciadv.adf6138

A comparison of plaster and stucco from 540 to 850 CE and those created by the team today reveals a striking resemblance. Maya masons most likely used sap-infused plaster because of its increased durability, plasticity, and water resistance.

Since ancient times, and in some cases even earlier, plaster, cement, and concrete have been used. These now-ubiquitous building materials have been used and improved by numerous civilizations, but not always the exact recipes used by our forebears are passed on intact, as in this instance. Archaeologists occasionally have to put in a lot of effort to understand how these materials were made.

“Our study helps to explain the improvement in the performance of lime mortars and plasters with natural organic additives developed not only by ancient Maya masons but also by other ancient civilizations (e.g., ancient Chinese sticky rice lime mortars),” the authors wrote in the paper.

The study is published in Science Advances.

DOI: 10.1126/sciadv.adf6138

Related Articles

Archaeologists Use Song to Unveil the Legendary End of West Africa’s Kaabu Kingdom

19 March 2025

19 March 2025

As the archaeological discoveries at Kansala, located in present-day Guinea-Bissau, reveal the tangible remnants of the once-mighty Kaabu Kingdom, the...

According to new research, medieval warhorses were shockingly diminutive in height

12 January 2022

12 January 2022

Medieval warhorses are often depicted as massive and powerful beasts, but in reality, many were no more than pony-sized by...

The Splendor of the Seven Descending Gods of Tulum Resurfaced

11 February 2024

11 February 2024

The National Institute of Anthropology and History (INAH) says the splendor of the seven Descending Gods of Tulum has resurfaced....

Columns in Lagina Hecate Sanctuary Rise Again

19 February 2021

19 February 2021

Lagina Hecate Sanctuary is located in Yatağan district of Muğla. It is an important sacred area belonging to the Carians...

Undeciphered Rongorongo Script from Easter Island may Predate European Colonization

12 February 2024

12 February 2024

From the depths of history, a wooden tablet bearing the mysterious “rongorongo” script has been unearthed from the small, remote...

Archaeologists have discovered a 4,000-year-old burial ground and shell tool processing site in Taiwan

1 August 2022

1 August 2022

A 4,000-year-old cemetery and shell tool processing site has been discovered in Kenting National Park, Taiwan’s oldest and southernmost national...

A Circular Structure Linked to the Cult of Kukulcán Discovered in Mexico

2 November 2023

2 November 2023

A team of researchers with the Mexican National Institute of Anthropology and History (INAH) has unearthed the remains of a...

The oldest evidence of human cannibalism as a funerary practice in Europe

7 October 2023

7 October 2023

According to a new study, cannibalism was a common funerary practice in northern Europe around 15,000 years ago, with people...

Study Reveals Mysterious Avars Origin

1 April 2022

1 April 2022

Ruled much of Central and Eastern Europe for 250 years, the Avars were less well known than Attila’s Huns, but...

Twin temples linked to Hercules and Alexander the Great discovered in Sumerian city of Girsu

29 January 2024

29 January 2024

Archaeologists discovered two temples, with one buried over the other, during excavations at Girsu, a Sumerian city in southeastern Iraq...

Assos Excavations Reveal 2,200-Year-Old Mosaic and Monumental Tomb

10 March 2025

10 March 2025

Archaeological excavations in the ancient city of Assos, situated in Behramkale village in Türkiye’s Çanakkale province in the northwestern part...

Archaeologists identified the first known tomb of a Warrior Woman with weapons in Hungary

5 January 2025

5 January 2025

A team of archaeologists led by Balázs Tihanyi of the Department of Biological Anthropology and the Department of Archaeology at...

Tens of Thousands of Ancient Bronze Coins Dating from the 4th Century Discovered Off Sardinia

4 November 2023

4 November 2023 1

A diver spotted something metallic at the bottom of the sea off the town of Arzachena in the Sassari province...

Anglo-Saxon monasteries were more resilient to Viking attacks than thought

31 January 2023

31 January 2023

Researchers from the University of Reading’s Department of Archaeology have found new evidence that Anglo-Saxon monastic communities were more resistant...

Ancient Yayoi Period Settlement Discovered on Tokyo Condo Development Site

10 December 2023

10 December 2023

Excavations at the former site of the British Embassy in Tokyo’s Chiyoda Ward have uncovered the remains of a Yayoi...