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|  14th September 2023, 07:24 PM | #23 | 
| Member Join Date: Mar 2006 Location: Room 101, Glos. UK 
					Posts: 4,259
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			Silver turns black quickly in sulphur compounds . Egg yolk contains sulphur. A drop of egg yolk on the  ganga will turn it black VERY quickly, depending on the silver content. Mine did.
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