Carbon dating half life period
I suspect, but haven't been able to confirm, that the reports of carbon 14 in these substances have been made up out of whole cloth by Young Earth Creationists, but I am loath to make this claim, absent evidence that reports of these findings haven't been published in any journals that aren't connected with such organizations as the Institute for Creation Science.
I further think that it is the fact that the claims are conscpicuously bogus that has accounted for their not having been responded to.
I eventually managed to find an excellent article (see the top of this post) using search tool.
don't forget that the assumptions can be checked by analysing what the sample was found in.
C14 has a half life of 5730 years and is only good to date objects to 50,000 years or so.