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This also has to be corrected for. Second, the ratio of C in the atmosphere at that time to be estimated, and so partial calibration of the “clock” is possible.
Accordingly, carbon dating carefully applied to items from historical times can be useful.
The common application of such posterior reasoning shows that radiometric dating has serious problems.That is, they take up less than would be expected and so they test older than they really are.Furthermore, different types of plants discriminate differently.So, we have a “clock” which starts ticking the moment something dies.Obviously, this works only for things which were once living.
However, even with such historical calibration, archaeologists do not regard C produced and therefore dating the system.