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Techniques for CollectorsCleaning cinnabar
1st Jun 2018 05:50 UTCCristian Biagioni Expert
I would like to know if someone has experience about cleaning cinnabar.
I have some specimens stained by iron oxides, with cinnabar on dolomite. I tried on an ugly sample using the Waller solution but cinnabar darkens from red to violet.
Do you have any suggestions how to clean cinnabar avoiding its darkening?
best regards,
Cristian
1st Jun 2018 17:05 UTCTed Hadley
22nd Jul 2018 00:26 UTCKeith Compton 🌟 Manager
For example see the following reference: http://www.minsocam.org/msa/collectors_corner/arc/cinnabar.htm
I think that all Cinnabars darken - some just take longer than others.
So I don't think it is your cleaning method necessarily producing the darkening (unless you are leaving the specimen in solution in the outdoors for an extended period !)
22nd Jul 2018 14:08 UTCThomas Lühr Expert
Do not apply the Waller Solution (or Iron Out) to minerals that can easy be reduced.
Hg2+=>Hg+=>Hg
Also (for example) it turns malachite and other Cu2+ minerals black due to a corresponding reaction.
Also, anglesite turns black while cerussite stays unchanged, strangely. (S6+ => S2- )???
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Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: May 10, 2024 09:24:10