17 September 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

Two unique mid-14th-century shipwrecks discovered in Sweden

22 April 2023

22 April 2023

During an archaeological dig in western Sweden this summer, the remains of two medieval merchant vessels known as cogs were...

New study reveals unique characteristics and complex origins of late Bronze Age swords discovered in the Balearic Islands

25 November 2024

25 November 2024

A recent study uncovered a wealth of new information regarding the production, material makeup, and cultural significance of Late Bronze...

Early Anatolian Genes: Genetic Links Between Girmeler Mound and 17,000-Year-Old Pınarbaşı Skeletons

16 April 2025

16 April 2025

Recent archaeological excavations at Girmeler Mound, located near the ancient Lycian city of Tlos in southwestern Türkiye, have not only...

Archaeologists unearth human spines threaded onto reed posts in Peru

5 February 2022

5 February 2022

Archaeologists have found almost 192 examples of human vertebrae threaded onto reed posts 500 years ago in the Chincha Valley...

1,600-year-old fragment Of Enigmatic Roman Artifact Discovered In Belgium

17 February 2023

17 February 2023

A metal detectorist in Belgium discovered a piece of a mysterious bronze artifact known as a Roman dodecahedron, which is...

Scientists reconstruct Late Bronze and Iron Age Mediterranean silver trade

11 July 2021

11 July 2021

Scientists have recreated the Eastern Mediterranean silver trade across a time span that includes the conventional dates of the Trojan...

World-first recreation of ancient Egyptian garden open

20 May 2022

20 May 2022

Have you ever wondered what an ancient Egyptian garden was like?  This is your opportunity to find out! The first...

Ancient Bone Flute Discovered in Iran Offers Rare Glimpse into 8,000-Year-Old Musical Traditions

29 June 2025

29 June 2025

The National Museum of Iran has launched an exciting initiative in collaboration with the Public Relations Department of the Ministry...

4000-year-old Temple With A 2.30 Meters Central Monolith Discovered in Cyprus

9 July 2024

9 July 2024

An Italian archaeological mission, the Erimi Archaeological Project of the University of Siena, discovered a 4,000-year-old temple in Cyprus. This...

Citizen scientists discover more than 1,000 new burial mounds in a Dutch archaeological project

29 January 2023

29 January 2023

A Dutch archaeological project in which thousands of amateur sleuths combed specialized maps and high resolution photographs resulted in the...

Croatian Team Finds a Way to Effectively and Permanently Preserve Stuka Aircraft Wreck Under the Sea

11 December 2024

11 December 2024

 The ICUA Zadar team of conservators and archaeologists carried out in situ underwater conservation of the wreckage of the Junkers...

Romanian Police Find the Stolen Viking Helmet

21 February 2021

21 February 2021

Romanian police specializing in heritage crimes recovered a medieval helmet of “Viking origin” on February 7, which had disappeared a...

Restoration Complete: Athena Temple in Side Reopens to the Public

24 March 2025

24 March 2025

The Athena Temple, once overshadowed by the more prominent Temple of Apollo, has emerged as a significant historical and cultural...

A Previously Unknown Bronze Age Settlement Discovered in Switzerland

18 February 2024

18 February 2024

In advance of a construction project in Heimberg, the Archaeological Service of the Canton of Bern carried out a rescue...

A 2900-year-old collection of fossilized shark teeth found in the City of David, one of Jerusalem’s oldest Parts

5 July 2021

5 July 2021

Scientists discovered an inexplicable collection of fossilized shark teeth at a 2900-year-old archaeological site in Jerusalem’s City of David, one...