Their findings, which appear in the ACS journal Langmuir, could have wide-ranging implications for both archaeology and palaeontology.
Luigi Dei and colleagues explain that a process similar to osteoporosis causes bones discovered at historically significant sites to become brittle and fragile — and in the process, lose clues to the culture they were once part of. Preserving them has proved challenging. Current techniques to harden and strengthen bones use vinyl and acrylic polymers.
They act as a sort of glue, filling in cracks and holding fragments together, but they are not ideal. In an effort to stanch the loss of information due to damage, Dei’s team set out to find a better way to preserve old bones.
The researchers turned to seashells for inspiration. Using skeletal fragments from the Late Middle Ages, they grew aragonite, a kind of lime that some sea animals produce to shore up their shells, on the bones in a controlled way.
The treatment hardened the surfaces of the bones, as well as the pores inside them, making the ancient remains 50 to 70 percent sturdier. “These results could have immediate impact for preserving archaeological and palaeontological bone remains,” the scientists conclude.
Contributing Source : American Chemical Society