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Patina on chert, Tampa Bay Woodland

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  • Patina on chert, Tampa Bay Woodland

    I found this point on the surface of a shell midden. We sometimes soak coral or chert (NON POROUS) in light mineral oil for hours to days in order to see the "original" color of the material. I do not like to do this and don't do it often. Acetone takes the oil back off/out. Here is a Columbia Point (PinCo) that I soaked and you can see the changes over time.
    Professor Shellman
    Tampa Bay

  • #2
    other side after 6 hours in acetone to take out the oil.
    Professor Shellman
    Tampa Bay

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    • #3
      Thanks for the info and pictures tom cool point
      TN formerly CT Visit our store http://stores.arrowheads.com/store.p...m-Trading-Post

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      • #4
        Hey Tom, That looks like the patina I see on Knife River Flint.
        Michigan Yooper
        If You Don’t Stand for Something, You’ll Fall for Anything

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        • #5
          Wow, what a difference that oil makes. Gem dealers will often soak their emeralds in mineral oil to hide the inclusions to try & get a better price.
          Child of the tides

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          • #6
            We have collectors down here that have backlit/oil filled caseboxes of filthy coral points..... Some people use ketchup and other goops on river points that actually take off the "last" layer of water/wet site patina. Flint River stuff.
            Professor Shellman
            Tampa Bay

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