File:Carbonate crystals forming on ancient bronze coin.ogv
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Carbonate_crystals_forming_on_ancient_bronze_coin.ogv (Ogg Theora video file, length 39 s, 208 × 208 pixels, 641 kbps, file size: 2.97 MB)
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This free media file is from Wikimedia Commons. Its description page is included below. |
Summary
| Description |
English: The coin had been immersed in an approximately 3% sodium sesquicarbonate/2% sodium bicarbonate w/v solution for four weeks to treat bronze disease.
It had been rinsed four times previously and surface water patted off with the same crystallisation observed due to carbonates having infiltrated the coin's surface. While unsightly it is not harmful to the coin. It can be brushed off but will reform over time. With continued soaking in water the carbonate will eventually be removed and the coin can be displayed or be coated with a surface sealant. The video's original duration was 6:30 seconds and has been accelerated to 10 times normal speed. The video starts immediately after rinsing and surface drying. No further crystallisation was obvious after 6:30. |
| Date | |
| Source | Own work |
| Author | Waerloeg |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 03:06, 8 April 2014 | 39 s, 208 × 208 (2.97 MB) | Waerloeg~commonswiki | User created page with UploadWizard |
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