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The amount of carbon-14 in the air has stayed the same for thousands of years.
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. .offers accuracy and precision in results, significant cost savings per sample, and meaningful age estimates for both archaeological features and the landforms which are the context of the archaeological site" (Frink 1997: 5). have led the reader through a comparison of the OCR Carbon-Dating procedure to the laws of thermodynamics, linear statistical analysis, and established scientific practices, concluding with the "doubt [that] so simple a method will ever be truly useful to archaeologists." Beginning with a brief history of the OCR procedure as developed by this researcher (not inventor), I address each of these issues in turn.The rapid spread of acceptance of OCR dating by archaeologists concerns us for three reasons: (1) No description of the method has yet appeared in a peer-reviewed journal. Variability in the ratio was found to be related to soil texture and depth (factors that affect the rate of oxygen diffusion), temperature and moisture regimes (factors that control the rate of biological processes), and soil p H and concentration of organic carbon (factors that contribute to the viability and speciation of biological populations in the soil).Hence, all these parameters must be assumed—always. Further it must be assumed that the parameters have not varied over the ‘life’ of the sample.Because these are assumed, we cannot have any confidence that the calculated age is correct.
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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.