X-rays reveal palm-leaf manuscript preparation

An international research team investigated palm-leaf manuscripts from South and Southeast Asia, using X-ray analysis and machine learning to understand how the leaves were prepared for writing.

For centuries, people in this region recorded knowledge on palm leaves, but reconstructing the original processing methods has become difficult. Researchers examined 160 manuscripts and reference materials, combining data from facilities in Germany and France to map the leaves’ internal structure and chemical composition without damaging them.

The team used small-angle X-ray scattering, wide-angle X-ray scattering, and X-ray fluorescence to gather detailed information about the materials. Machine learning then helped them identify patterns related to both the plant species used and the ways the leaves were processed. The analysis successfully distinguished between two palm genera and showed that processing techniques created measurable changes in the leaf material. However, determining the exact geographical origin of the manuscripts proved more challenging.

Samples from Sri Lanka and southern India shared many material similarities, suggesting common processing traditions. While Thai samples showed a distinct profile, the researchers cautioned that limited sample sizes and the effects of age and preservation make definitive geographical attribution impossible at this time. They emphasize that material analysis should complement, not replace, traditional manuscript research, offering new insights when combined with historical and codicological evidence.