X-ray diffraction of blackened particles produced no discernable pattern, indicating concentrations below the detection limit, poor crystallinity, or both.
This is consistent with abiotic and biotic mechanisms of varnish formation, as alkalinity inhibits the concentration of manganese in both models.
Thus, RASI was developed to "triage" rock art panels.
This page is meant to provide quick access to state-of-the-art knowledge about rock varnish and its use in understanding the priceless heritage of rock art.
Liu compiled a massive data base that has now launched varnish microlaminations (VML) as the ideal method to understand petroglyph chronology in the Holocene and terminal Pleistocene (
At the same time, rock varnish was viewed holistically within a new framework.