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– When selecting samples to send to the lab for radiocarbon dating, please take note that charring is a major significance.Ten milligrams (10 mg) of charred grain is a very different sample from 10 mg of non-charred grain.If the seeds or grains are well preserved, dry and do not have any adhering sediment on them, 4 mg should be sufficient for AMS dating.

Blue beads from Bohemia with French Brass trade beads.It’s difficult to know exactly how much material the lab will need from any given sample. It’s not uncommon for the lab to see a 15% reduction in weight just by putting a dry sample in an oven overnight at 110ºC.Usually after pretreatment, the sample size is reduced by 30-70% depending on many factors relating to the species type, preservation, moisture content, etc.These are Milk Glass trade beads found in North Carolina.The most common Chevrons are the blue, red, and white combination.

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Bead prices varied with location, demand, and how bad Indians wanted a particular bead.

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