10.1371/journal.pone.0181586.g004 Patrick Schmidt Patrick Schmidt David J. Nash David J. Nash Sheila Coulson Sheila Coulson Matthias B. Göden Matthias B. Göden Graeme J. Awcock Graeme J. Awcock Plot of the temperature-dependent change in saturated red reflectance as a percentage of the saturated colour magnitude. Public Library of Science 2017 heat treatment MSA stone tool knapping Cape African Middle Stone Age Heat treatment silcrete heat treatment 2017-07-19 17:46:34 Figure https://plos.figshare.com/articles/figure/Plot_of_the_temperature-dependent_change_in_saturated_red_reflectance_as_a_percentage_of_the_saturated_colour_magnitude_/5223256 <p>Plot of the temperature-dependent change in saturated red reflectance as a percentage of the saturated colour magnitude.</p>