Could there be other influences that would affect the rate of decay of carbon 14?
If it has generally been established as a constant, at what point does the "constant" break down?
It does not work on rock, for example, but does work on wood.
So, an old spear can be tested at the wooden shaft, but not the sharp stone head.
Acetone is sometimes used while extracting fossils, because it dissolves dirt.
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If you hear of a carbon dating up in the millions of years, you're hearing a confused report. Second, they rarely contain any of the original carbon.
We can't date oil paints, because their oil is "old" carbon from petroleum. And third, it is common to soak new-found fossils in a preservative, such as shellac.