If the sample is freshly burned there will be no oxidizable carbon because it would have all been removed by the combustion process. Prehistoric and Historic Excavations at Site 9Gw347, Annistown Road Improvement Project, Gwinnett County, Georgia. Over time this will change and the amount of organic carbon will decrease to be replaced by oxidizable carbon.  Kindall, Sheldon 1997 The Oxidizable Carbon Ratio (OCR) Technique: A New, Low-Cost Dating Method. New South Associates, Inc., Stone Mountain Georgia.
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Oxidizable carbon ratio dating is a method of dating in archaeology and earth science that can be used to derive or estimate the age of soil and sediment samples up to 35,000 years old.