According to a new study, Neanderthals were using an ochre-based compound as a glue-like adhesive at the Mousterian type site in Le Moustier, France, around 40,000 years ago.
Led by Patrick Schmidt at Eberhard Karls University of Tübingen in Germany, and published in Science Advances, the study documents the earliest known use of a multi-component adhesive in Europe, indicating complex cognitive abilities and technological innovation among Neanderthals.
A STICKY SITUATION
The research team reexamined stone tools from Le Moustier, which had been untouched since the 1960s, and found traces of a mixture of ochre and bitumen on several artifacts, including scrapers, flakes, and blades. Ochre, a naturally occurring reddish earth pigment, and bitumen, a common component of asphalt, were combined to create a sticky glue-like mass for tool making.
This mixture was found to be more than 50% ochre, which was surprising to the team because air-dried bitumen alone can serve as an adhesive, but loses its adhesive properties when mixed with such large proportions of ochre. So the team ran some tests.
Hellbound and Down 