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Another physical pretreatment done on samples for carbon dating involves the removal of contaminants by scraping off the exterior layers using the applicable equipment.Surgical scalpels are used to scrape contaminants off charcoal while dental drills are used on large bones.

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The degree of contamination affects the magnitude of the inaccuracy in the carbon 14 dating results.Limestone is of geological origin and would be much older than any archaeological sample; hence, inclusion of limestone during the carbon 14 dating would make the sample older than its true age.Humic and fulvic acids are naturally present in soil where microbial degradation of plants and animals has occurred.In general, infinite-age contamination can make a sample considerably older while modern contamination can make the sample significantly younger than its true age.Regardless of the carbon dating methodology employed, be it radiometric dating or the accelerator mass spectrometry (AMS) method, a process must be done before analysis to get rid of all possible contaminants. Radiocarbon dating labs receive various materials for analysis but not all portions of the samples can be used.

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