File:Copper Point (FOUS 98266) (a7bde3c9-1dd8-b71b-0bf4-162e1ceedc3b).jpg

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Summary

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English: Copper Point (FOUS 98266)
Photographer
English: NPS photo
Title
English: Copper Point (FOUS 98266)
Publisher
English: U.S. National Park Service
Description
English:

Copper point.

This copper projectile point was found during Fort Union’s 1988 archeological excavations. Notice anything unusual? The green coloring you see is not a decorative element but rather copper carbonate, the presently stable byproduct of a once corrosive chemical reaction caused by contact with moisture and salts while covered by dirt. That chemical reaction can also be triggered by exposure to high humidity and air pollution, which is why outdoor statues such as the Statue of Liberty and older pennies, which are made of copper and copper alloys, sometimes have similar green coloration.

  • Keywords: fort; union; trading; post; fur; trade; projectile; point; arrowhead; fous
Depicted place
English: Fort Union Trading Post National Historic Site
Date Taken on 21 February 2017
Accession number
a7bde3c9-1dd8-b71b-0bf4-162e1ceedc3b
Source
English: NPGallery
Permission
(Reusing this file)
Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.
NPS Unit Code
InfoField
FOUS

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current06:25, 14 May 2024Thumbnail for version as of 06:25, 14 May 20241,200 × 770 (162 KB)BMacZeroBot (talk | contribs)Batch upload (Commons:Batch uploading/NPGallery)

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