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acid tested gold turned black help

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New Member

United Kingdom
2 Posts
 Posted 03/14/2012  9:24 pm Show Profile Bookmark this topic Add winterwhite11 to your friends list Get a Link to this Message

hello, sorry to bother everyone with a complete novice question but I wonder if any one can help?
i know nothing about jewellery except what 9ct etc..means.
i bought a lovely filligre bracelet off eBay about 13 grams in weight
it is marked in 2 places as 14k gold
i noticed that the clasp which has a 14k hallmark on is magnetic ,though the rest of the bracelet is not .
i bought a acid testing kit and put a bit on the magnetic clasp and found that the gold I tested turned black
is it meant to do that? it looks awfull.
i also put some solution on the fine filligre part and the gold has gone a darkish brown colour plus acid has eaten through gold and 1 fine link has come away from clasp .
my bracelet looks awfull with the black and brown colouring.
do you think bracelet is gold or not?
1 clasp marked 14k is magnetic ans other clasp end also marked 14k and main bracelet is not magnetic...
I have ruined my bracelet and also have loads of yellow marks on my hand where I got acid on me..
thankyou for any advice.

New Member
United States
1 Posts
 Posted 03/14/2012  10:06 pm  Show Profile Bookmark this reply Add DCDaniel to your friends list Get a Link to this Reply
Firstly, there are only three metals that are attracted by a magnet: iron, nickel, and cobalt. Secondly, there is only one (combination) acid that dissolves gold- Aqua Regia, a combination of concentrated nitric and hydrochloric acids which bubbles like champaigne even after months.

The point of this post is to say you were ripped of. You should immediately report this to eBay and Paypal.
Pillar of the Community
United States
669 Posts
 Posted 03/14/2012  10:14 pm  Show Profile Bookmark this reply Add Americanamafia to your friends list Get a Link to this Reply
Since you already trashed it, cut the bracelet in half with wire cutters test the inside of the bracelet. Take pictures before and after, and if it is still junk go though eBay. It sounds likely more than not you got taken. If your not familiar with how to use the tester, and it seems you have been buying jewelry for scrap, take a known good piece and practice on that.

If all else fails take it to a pawn shop/ jeweler and try and "sell" it to them. If they say its junk too....
Edited by Americanamafia
03/14/2012 10:15 pm
New Member
United Kingdom
2 Posts
 Posted 03/14/2012  10:36 pm  Show Profile Bookmark this reply Add winterwhite11 to your friends list Get a Link to this Reply
hi thanks guys, can I just ask though , does gold go black after having acid put on it and what about it turning a darkish brown as well..
Pillar of the Community
United States
3670 Posts
 Posted 03/14/2012  10:59 pm  Show Profile Bookmark this reply Add Silverhawk74 to your friends list Get a Link to this Reply
I work at a coin/jewelry store, and we would test that piece by lightly rubbing a section deemed to be gold onto a rock sharping stone. Then we use different levels of acid to determine if a piece is 10K or 14K for example....

The acid we use to determine 18K for example will turn a rub mark from a 14K piece black as it should, while the 14K acid does nothing to the mark an it holds up to it. I assume the 18K acid is a more concentrated nitric acid....

Also, note the clasp could be just gold plated perhaps an not gold at all, while the piece could be. But in all likely-hood you got a fake there like mentioned above....
Pillar of the Community
United States
2104 Posts
 Posted 03/15/2012  06:35 am  Show Profile Bookmark this reply Add chris12018 to your friends list Get a Link to this Reply
Once you get this resolved, you should let the members here know who the seller was.
Valued Member
United States
264 Posts
 Posted 03/15/2012  08:10 am  Show Profile Bookmark this reply Add rgathright to your friends list Get a Link to this Reply
How much did you pay for the bracelet?
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Australia
11235 Posts
 Posted 03/15/2012  08:55 am  Show Profile Bookmark this reply Add Sap to your friends list Get a Link to this Reply

Quote:
hi thanks guys, can I just ask though , does gold go black after having acid put on it and what about it turning a darkish brown as well..

I think the short answer to your question is "no". Gold shouldn't discolour or turn black with addition of acid; even the relatively dilute golds like 14k and 8k should just dull slightly, not turn black. Turning black sounds more like something brass would do.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
Pillar of the Community
Australia
8873 Posts
 Posted 03/15/2012  09:28 am  Show Profile Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
Philosophically, you have not done any damage at all.
If the 'jewelry' is fake, you have not decreased it's value, because it had none to begin with.

So, from that point of view, do not feel bad about how the testing has turned out, or what 'damage' may have occurred.

You need to seek redress from the dishonest 'pond life' who has dealt with you, and you now have the evidence to proceed against that individual.
Pillar of the Community
United States
2026 Posts
 Posted 03/15/2012  09:56 am  Show Profile Check trdhrdr007's eBay Listings Bookmark this reply Add trdhrdr007 to your friends list Get a Link to this Reply
The spring inside a lobster claw style clasp will be attracted by a magnet. I wouldn't call fake based on that, but the rest of your description leads me to believe the item is not gold. I have picked up pieces that novices claimed were fake that turned out to be real. The test results are only as good as the operator.
Rest in Peace
United States
9104 Posts
 Posted 03/24/2012  04:18 am  Show Profile Bookmark this reply Add biggfredd to your friends list Get a Link to this Reply
, winterwhite11 and DCDaniel!


Quote:
i know nothing about jewellery except what 9ct etc..means.

9ct is a weight. 9k is a purity.


Quote:
i noticed that the clasp which has a 14k hallmark on is magnetic ,though the rest of the bracelet is not .

Anyone with a metal stamp can put 14k on something. Lobster clasps have a steel spring in them, which is OK.


Quote:
i bought a acid testing kit and put a bit on the magnetic clasp and found that the gold I tested turned black
is it meant to do that? it looks awfull.

No instructions? 14k should turn light tan.


Quote:
i also put some solution on the fine filligre part and the gold has gone a darkish brown colour plus acid has eaten through gold and 1 fine link has come away from clasp .

Doesn't sound good.


Quote:
my bracelet looks awfull with the black and brown colouring.
do you think bracelet is gold or not?

From what you say, no, but remember, no one here has a clue if you know what you're doing.


Quote:
1 clasp marked 14k is magnetic ans other clasp end also marked 14k and main bracelet is not magnetic...
I have ruined my bracelet and also have loads of yellow marks on my hand where I got acid on me..

It'll wear off as new skin grows out in a week or two.


Quote:
thankyou for any advice.

When f***ing with acid, wear a rubber. Glove.
Rest in Peace
United States
9104 Posts
 Posted 03/24/2012  04:25 am  Show Profile Bookmark this reply Add biggfredd to your friends list Get a Link to this Reply

Quote:
hi thanks guys, can I just ask though , does gold go black after having acid put on it and what about it turning a darkish brown as well..


No idea what you're using, but straight nitric:

lead, pewter - black
18k+ - no change
14k yellow - light tan
14k white - darker tan
10k yellow - brown
10k white - darker brown
copper - bubbling green/blue
silver - chalky white
Pillar of the Community
Mexico
1277 Posts
 Posted 03/24/2012  2:43 pm  Show Profile Bookmark this reply Add harrison2 to your friends list Get a Link to this Reply
Sorry to hear about this, but I ran into some "silver" that texted black and the acid ate through it as well. End result? Not silver and I sent back to the seller.
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