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tline3open  Does carbon mesh absorbs hydrogen sulfides?

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Author Topic:   Does carbon mesh absorbs hydrogen sulfides?
Scott Martin
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Posts: 11520
Registered: Apr 93

iconnumber posted 07-05-2005 08:45 AM     Click Here to See the Profile for Scott Martin     Edit/Delete Message   Reply w/Quote
    Does carbon mesh absorbs hydrogen sulfides?

Does anyone have any experience with these types of "carbon blocks" to prevent tarnish products?

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Marc

Posts: 414
Registered: Jun 2002

iconnumber posted 07-08-2005 02:21 AM     Click Here to See the Profile for Marc     Edit/Delete Message   Reply w/Quote
Hi Scott,

Tell me about the Carbon fiber mesh. Is it filiments of Carbon? Are they coated with something? Or better yet, give me the name brand and I will talk to the folks who manufacture it. I only have a BS in Chem, but I have friends with a little more education that I can call.

Happy to help..

Marc

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Scott Martin
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Posts: 11520
Registered: Apr 93

iconnumber posted 07-08-2005 06:57 AM     Click Here to See the Profile for Scott Martin     Edit/Delete Message   Reply w/Quote
Mark,

The first time I saw this it was years ago at the NY Historical Society. Reading the label through the case I determined a product name (long since forgotten) and that it was made in the UK. For a while I tried to find these but no luck. Every once and a while when I think of it I go looking. This week I found that H S & C are selling a Jewelry box with a carbon liner also they have carbon blocks to place inside a case. Both are supposed to absorb hydrogen sulfides and prevent tarnishing.

quote:
Tarnish Prevention Carbon Blocks

These inserts can be placed inside a cabinet, chest, or drawer, where a powerful carbon mesh absorbs hydrogen sulfides and other airborne agents, that tarnish sterling or silver plated items. Instead of having to remove tarnish with harsh chemicals and intense scrubbing, the patented fabric that fills these cubes attracts and holds these harmful contaminants, preventing tarnish from occurring in the first place. The set contains a vertical insert for cabinets and a horizontal one for drawers, each of which is guaranteed to absorb silver-tarnishing contaminants for 10 years. Using both inserts in a standard size china hutch will guarantee no tarnish for 10 years. Oak finish. Cabinet Insert: 4” H x 3 3/4”W x 3” D. Drawer Insert: 4 1/2” L x 3” W x 2 3/4” D. (12 oz.)


This is all I know.

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Marc

Posts: 414
Registered: Jun 2002

iconnumber posted 07-08-2005 10:40 AM     Click Here to See the Profile for Marc     Edit/Delete Message   Reply w/Quote
Hi again Scott,

It is amazing what runs through ny mind at 2:30 AM... and not very clearly at all!.

Anyway, it is morning and I am awake.

Certain forms of carbon are much more reactive with oxidizers (sulfides for example) than silver is, so the carbon will react and combine with the sulfide (oxidizer) faster than the sterling silver will. In a closed or semi-closed drawer or cabinet with restricted circulation, both the carbon and the silver will react, but not only does the Carbon react faster, but this Carbon product is presented in such a way as to have a much greater surface area than the silver. It is probably very finely ground and suspended to maximize its surface area. the more exposed surface area, the more sites that are available for reactions with the oxidizer.

Basically, the Carbon product is a very large piece of flypaper with lots of sticky stuff on it, and the silver is a much smaller piece with much less sticky stuff on it.

Hope this helps.. Marc

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Bob and Carol Carnighan

Posts: 63
Registered: Apr 99

iconnumber posted 07-10-2005 04:35 PM     Click Here to See the Profile for Bob and Carol Carnighan     Edit/Delete Message   Reply w/Quote
The carbon product you seek is called "activated charcoal" and it can selectively adsorb certain undesired compounds in mixtures.
It can be purchased in drug stores and given by mouth to adsorb a toxic drug ingestion. It is found in some gas masks. Tarnishing can be eliminated by charcoal adsorbtion of the offending sulfur molecules. The following link contains information applicable to silver:

Sorbents for Gaseous Pollutants in Showcases

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Scott Martin
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Posts: 11520
Registered: Apr 93

iconnumber posted 07-10-2005 07:10 PM     Click Here to See the Profile for Scott Martin     Edit/Delete Message   Reply w/Quote
Mark, Bob & Carol,

Thanks.

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Dale

Posts: 2132
Registered: Nov 2002

iconnumber posted 07-10-2005 11:56 PM     Click Here to See the Profile for Dale     Edit/Delete Message   Reply w/Quote
One traditional method of doing this was by placing ordinary chalk around silver in cases. It always seemed to work fairly well. And as chalk is not a controversial product (being free range, non sexist/ homophobic/ ethnophobic/ culture free/ onandonandon) I found it an excellent choice. Plus, it is easy to come by, sold all over the place.

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