Before c.100,000 years ago, or the end of the #MiddlePleistocene say 130,000 years ago, the ONLY repeated material cultural evidence involving signaling behaviours in Homo is the #archaeological record of earth #pigment use.
Going back c.500,000 years -- that is pre- Homo sapiens -- this overwhelmingly comprises blood-red iron oxides, known as ochre, including #haematite and the sparkly #specularite. Sites like #WonderwerkCave and #CanteenKopje in the Northern Cape have the oldest pigments which Ian Watts has analysed here
https://www.journals.uchicago.edu/doi/full/10.1086/686484
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Images: View from the back of Wonderwerk Cave, a huge space carved by an ancient river deep into the hillside. Pieces of sparkly specularite and blood-red haematite are some of the world's oldest pigments