File:Carbonate crystals formed on ancient bronze coin.png
Original file (1,448 × 658 pixels, file size: 1.68 MB, MIME type: image/png)
 | This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
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 green mass on the coin's reverse is a copper carbonate that formed in the region where the bronze disease was most prevalent. It will be physically removed to ensure that the chlorides have also been removed prior to further conservation efforts. The photos were taken some 20 minutes after rinsing and surface drying. Video footage of the crystallisation is also on wikipedia: Carbonate crystals forming on ancient bronze coin.ogg |
| Date | |
| Source | Own work |
| Author | Waerloeg |
Licensing
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 03:26, 8 April 2014 | | 1,448 × 658 (1.68 MB) | Waerloeg~commonswiki | User created page with UploadWizard |
File usage
Global file usage
The following other wikis use this file:
- Usage on hr.wikipedia.org
