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Techniques for CollectorsCleaning Dioptase
28th Jun 2011 07:36 UTCAnonymous User
Report on cleaning Dioptase:
I tried to clean Dioptase crystal from a little matrix using a 30% HCl.
The Dioptase has melted and the solution is now full of a green gel...
-Kostas.
28th Jun 2011 10:17 UTCAlfredo Petrov Manager
28th Jun 2011 11:33 UTCJolyon Ralph Founder
28th Jun 2011 15:11 UTCAnonymous User
It was not an important piece,so Ihad no worries.
I just make sure I report,so that other members know that!
Thank you!~
28th Jun 2011 18:46 UTCDavid Von Bargen Manager
30th Jun 2011 21:59 UTCMarc Maseman
By organic and inorganic, I am not talking about organic in the sense of agriculture. In chemistry, we are are talking organic acids being ones that contain carbon. Inorganics contain no carbon.
Inorganics like HCL are one Hydrogen and one chloride. This is extremely volatile. An organic acid like citric acid is C6H8O7, which is obviously much, much larger and much less volatile.
From Wikipedia, some info on organic acids: Organic Acids on Wikipedia
Edit: No advertising please !
1st Jul 2011 01:14 UTCSteve Hardinger 🌟 Expert
And there are plenty of inorganics with carbon. Calcite, for one.
1st Jul 2011 10:13 UTCPeter Haas
This is bare nonsense.
1st Jul 2011 12:03 UTCRock Currier Expert
1st Jul 2011 15:09 UTCSteve Hardinger 🌟 Expert
6th Jul 2011 00:37 UTCAnonymous User
Any species (not to say any specimen) needs a specific acid.Some species can be cleaned by more than one acid.
If a compound is organic,then it contains Carbon.The opposite is not true.
To my knowledge,when an acid or a base is a solid salt,the aqueous solution vapors is water.So Citric acid cannot be less volatile at room temperature.
Steve,HCl solution isn't volatile?What the vapor consists of?
6th Jul 2011 04:08 UTCPeter Haas
To my knowledge,when an acid or a base is a solid salt,the aqueous solution vapors is water
No. All components of the liquid phase are also contained in the gas phase (though at different concentrations). Even a ionogenic compound dissolved in water has a finite partial pressure in the gas phase above the solution, although this is exceedingly small. Anything else would be a violation of the second law.
So Citric acid cannot be less volatile at room temperature.
Less volatile than what ?
6th Jul 2011 15:26 UTCDavid Von Bargen Manager
Vapor pressure at 25C is 190 mmHg
You don't really want to breathe the fumes - very bad for the lungs. I have had metal corroded that was in proximity to closed bottles of muriatic acid (screw top plastic jugs).
6th Jul 2011 16:56 UTCEvan Johnson
6th Jul 2011 16:56 UTCEvan Johnson
EMJ
6th Jul 2011 23:44 UTCRoger Lang Manager
-------------------------------------------------------
> From the MRDS sheet for hydrogen chloride.:
> Vapor pressure at 25C is 190 mmHg
>
> You don't really want to breathe the fumes - very
> bad for the lungs. I have had metal corroded that
> was in proximity to closed bottles of muriatic
> acid (screw top plastic jugs).
You should see my bathroom .. i once forgot a small open container with 10 % HCl and left for 2 weeks ... meanwhile the water evaporated and the concentration of HCl reached the "smoking" conc besides the "normal" HCl evaporation.. my metal fittings are a wreck now ;-) and the atmosphere was at least hostile when i came back. Fortunately i had closed the bathroom door.
7th Jul 2011 03:46 UTCAnonymous User
Peter,thank you for correcting me.I've asked this question so many times and I always get a different answer.
Less went as an answer to the previous post claiming that Citric acid is less volatile than HCl and other acids.
Both solutions of Citric and HCl have odor (practically when I open the container,so I should have guessed that vapors are not just water (Citric).
Keep chemicals outside the house at a well protected places and the containers sealed as well.Animal and people can be harmed.
I've seen nervous system disorders due to working at chemical stores and all the bottles were closed.Keep all safety rules and ask here about them.
Everyone is asking about minerals and I only once saw a post about safety.
I remind everyone that NOT in all countries concentrated compounds are illegal and they are easy to buy.
I have a friend who had half his hand tissues necrotic after he tried to clean a specimen with Hydrofluoric and the glove was pierced.The doctors didn't know how to react and they didn't provide any Calcium medicament.I'm sure in the future he will face internal organ failure.Thankfully he's still alive.
I recommend that someone writes down an article about safety and it will be always visible for users of this forum.
-Kostas.
16th Jan 2014 17:49 UTCMolly Gove
What is a safe and accessible way to clean the rust off without hurting the crystals?
Thank you!
17th Jan 2014 12:59 UTCRock Currier Expert
Could you give us a picture of the dioptase you hope to clean?
17th Jan 2014 21:28 UTCMolly Gove
is there anything you know of to clean that will not hurt the dioptase crystals?
17th Jan 2014 21:38 UTCMolly Gove
do you know of something that is sort of easy to get for a lay-person to clean with that will not hurt the dioptase crystals, but will remove the rust?
17th Jan 2014 21:54 UTCRock Currier Expert
17th Jan 2014 22:10 UTCSteve Hardinger 🌟 Expert
17th Feb 2014 01:49 UTCBarry Miller
-------------------------------------------------------
> there is more rust now than when this photo was
> taken.
>
> do you know of something that is sort of easy to
> get for a lay-person to clean with that will not
> hurt the dioptase crystals, but will remove the
> rust?
>
I don't understand - why is the rusty colored material increasing? Anyone know?
17th Feb 2014 17:00 UTCDoug Daniels
24th Feb 2014 23:11 UTCRoger Lang Manager
Acids were quite bad - even nitric which should spare the dioptase but may produce unpleasant yellowish and otherwise unnatural colours if not rinsed thoroughly.
Molly your specimens looks like Kaokoveld (either Omaue or one of the neighboring occurrences) .. i dealt with them and if the matrix is clayey - don´t do anything* .. the specimen doesn´t look that bad as you posted it.
Cheers
Roger
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Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 24, 2024 13:34:44