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Dogū (Japanese: 土偶, IPA: [doɡɯː]; literally "earthen figure") are small humanoid and animal figurines made during the later part of the Jōmon period (14,000–400 BC) of prehistoric Japan.
Dogū come exclusively from the Jōmon period, and were no longer made by the following Yayoi period. There are various styles of dogū, depending on the exhumation area and time period.
originally posted by: darmstadtiumpromise
a reply to: Arbitrageur
All that to say, the carbon based impurities found within the diatomaceous earth the mummies look to have been covered with can skew any carbon dating results and give an artificially older date.
Keratin Materials
Preferred submission size: >100 mg
Minimum submission size: 30 mg
Keratin is an insoluble structural protein resistant to proteolytic enzymes. Therefore, it is often well preserved in conditions unfavorable to other sample types. The diversity of keratin materials suitable for radiocarbon dating include horn, hoof, hair, fur, feather, claws, and nails.
Like plant materials, the radiocarbon dating of keratin targets the carbon that forms the structure of the material.
Sample Selection
Keratin materials tend to be limited in quantity. Your submission of visually clean and structurally robust material is preferred, if available. Please contact us for assistance with a sampling strategy if all available material cannot be submitted.
Pretreatment
Many keratin samples are first given an organic solvent pretreatment to remove oils, waxes, greases, varnish, or preservatives. All keratinous samples then receive an acid-base-acid pretreatment to remove carbonates, humates and humic acids.
www.directams.com...#:~:text=A%20Leather%20or%20parchment%20sample,carbonates%20and%20humic%20acids%2C%20respectively.
originally posted by: darmstadtiumpromise
a reply to: Arbitrageur
A lot of carbon dating is done at university labs which are frequently primarily staffed with undergrads and low level grad students, so my confidence in any skin samples being well cleaned is low.