The first uses of colour: what do we know?

Colour strongly shapes our perception of the world and plays a main role in the emergence of language and in the transmission of information. It has been shown that systematic use of ochre, along with other cultural traits that reflect cognitive complexity, disappear and reappear from the archaeological record, suggesting that cultural transmission follows discontinuous trajectories that to this day are unknown to us. Understanding when humans started using colour and how this feature evolved may therefore be instrumental to understand the evolutionary paths followed by members of our lineage towards cultural complexity. The earliest secure evidence for ochre use is found at 300.000-year-old archaeological sites from Africa and Europe. It usually consists of iron-rich rocks characterized by a red, orange, yellow or brown colour and/or streak, modified by grinding, scraping and knapping to produce red or yellow powder, ochre residues adhering to different types of artefacts or sediment stained with ochre or rich in ochre microfragments. Around 160 ka, ochre use becomes a recurrent feature. Although analyses of ochre collections have become increasingly frequent, there is still very little information on the first instances of ochre use and on how this cultural feature evolved through time. Most cases of early evidence for colour use by different human fossil species were recovered during excavations conducted several decades ago, when ochre was not documented systematically. Excluding a few recently studied cases, there is often a lack of evidence to support the anthropogenic nature of these findings. The aim of this paper is to summarise what we know on ochre use during the Lower Palaeolithic / Early Stone Age (ESA) and Middle Palaeolithic / Middle Stone Age (MSA), review techniques currently used for the analysis of this material and highlight analytical and theoretical issues surrounding this complex cultural feature.