File:Carbonate crystals forming on ancient bronze coin.ogv

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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	8 April 2014, 14:48:57
Source	Own work
Author	Waerloeg

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	Date/Time	Dimensions	User	Comment
current	21:06, 7 April 2014	(2.97 MB)	imagescommonswiki>Waerloeg~commonswiki	User created page with UploadWizard

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