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Also, one must consider the homogeneity of the reformed carbonate in that case.Different fragments could be reformed from multiple sources of CO2.When the residue is so thin that only a sooty powder can be removed, it is difficult (if not impossible) to perform an alkali treatment to remove humic acids that may have come in contact with the material from overlying sediments or surface or ground water interactions.2- Date the bulk sherd organics comprised of the organics in the clay that survived the firing and absorbed organics from food or liquid storage For sherds that do not have any burned food residue extractable from the interior of the vessel, the next best thing is to date the “bulk sherd organics,” which are the total organic materials from the clay or tempering agents, anything the pot may have been used to hold during its usage, and any organic substances that have come into contact with the sherd since burial.
You are welcome to request that we contact you after the pretreatment to discuss options for AMS dating.
Depending on the consistency of the soot, the pretreatments may be varied allowing for either acid or acid and alkali.
Accuracy relative to the time of use of the fires will depend upon the source of the soot.
The lab is more than happy to extract the residue then return the sherd to clients as requested.
Please make sure to indicate on the data sheet if the sherd needs to be returned.