Friendly Metal Detecting Forums   NWI Metal Detectors
List all sponsors

Go Back   Friendly Metal Detecting Forums > Everything About Finds > Help To ID My Finds

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 09-08-2010, 10:45 AM
FL-Hunter's Avatar
FL-Hunter FL-Hunter is offline
Senior Member
 
Join Date: Apr 2008
Location: Coral Springs, FL
Posts: 485
Default Acid Testing Your Gold Silver & Platinum

For those who are not versed on how to Acid test their metals, I decided to post this informative document on how to acid test. This should help some fellow forum members out there.

FL-Hunter


This is a simple guide to test precious metals with testing acids.
You will need the acids, test stone to rub the metal onto and cloth or napkins.
Please note that the acid will stain your skin or worse, so be careful not to spill any on yourself and don’t even think of getting any in your eyes.
Gold:

There are 9kt, 14kt, 18kt and 22k testing acids.
The process is simple, scratch or rub the metal (jewelry) onto the testing stone. Try to do it in a spot that won’t be noticeable.
Place app half a drop of the closest acid to the karat you estimate the metal to be. Mostly I like to start with 14kt and move up or down.
  • If the acid dissolves the metal it’s less then the karats on the bottle and you should try again with lower level acid.
  • If it dissolves the metal slowly, it’s possible you would have a bit less then the karat of the acid in the bottle.
  • If the metal stays it’s most likely the karat of the acid in the bottle.

Platinum

Should stay and not dissolve under the platinum acid. Some platinum is 800 type of platinum and will dissolve a bit.

Silver:

Rub extra metal onto the stone, apply a nice drop and wait for a reaction.
  • 0.999 pure silver will turn bright red color
  • 0.925 sterling silver will turn dark red color
  • 0.800 silver will turn brown color
  • 0.500 silver will turn green

What should you have in your test kit?

A wooden box to keep the corrosive acids safely confined. Test stone, Testing needles (preferred)
10K, 14K, 18K, 22K, 24K, Silver & Platinum Acids for a complete set.
If you are trying to cut a few corners and want to save some money, you can forgo the 24K because if it holds up to 22, you know its 24K.
You can also forgo the 22k if you want. If it holds up to 18K then you will know its either 18K or higher, but you will never know for certain how much higher.

For me, I stock it all except the 24K which is pure gold. The way I see it, if it holds up to 22K then I know its either 22 or 24K. There is not much of either out
there, but they do exist.


**** One important note to make, the Acids are only good for about 6 months, which means after 6 months, the acid is not as strong and will not work as
effectively. If you are using it has a hobbyist to identify items you already have, I would say you can stretch that out a bit, however if you are using it to
make money, you need fresh acids every 6 months to ensure accuracy. To clean your testing stone you can take a drop or 2 of (3 in 1 oil) or similar oil and
use a black wet sanding paper (very very fine) and lightly clean your stone with that. Then wipe it off with a paper towel. Your stone should be as good as new.

Well hope this helped out a bunch of you guys. As I find more informative items, I will post 'em. Happy Hunting everyone!

__________________
FL-Hunter - Garrett Ace 150/250, Minelab Excalibur II Vibra Probe 570, RTG Scoops $32.20 since June 2010

Reply With Quote


1 members found this post helpful.
  #2  
Old 09-08-2010, 10:48 AM
sectshun8's Avatar
sectshun8 sectshun8 is offline
Elite Member
 
Join Date: May 2008
Location: Golden, CO
Posts: 9,547
Default

Good writeup, I know I didn't have a clue

__________________
Jimmy - Minelab X-Terra 30 | White's BHID300 | White's Spectrum XLT | Tesoro Compadre | Vibra-Probe 570 | Garrett Pro-Pointer
2012 Totals: 112 coins @ $10.04
My Albums | My Blog
US Army - OIF/OEF Vet

Reply With Quote


  #3  
Old 09-08-2010, 10:51 AM
FL-Hunter's Avatar
FL-Hunter FL-Hunter is offline
Senior Member
 
Join Date: Apr 2008
Location: Coral Springs, FL
Posts: 485
Default

Quote:
Originally Posted by sectshun8 View Post
Good writeup, I know I didn't have a clue
I just edited the text a bit, you may want to re-read it. I added some other stuff to it that I forgot.

Glad you liked it.

__________________
FL-Hunter - Garrett Ace 150/250, Minelab Excalibur II Vibra Probe 570, RTG Scoops $32.20 since June 2010

Reply With Quote


  #4  
Old 09-08-2010, 11:03 AM
JBEXPRESS's Avatar
JBEXPRESS JBEXPRESS is offline
Lunch Time Bandit
 
Join Date: Oct 2009
Location: Dirty South!
Posts: 11,810
Default

Great info! Now I can go test my scrap to see if I have any silver. lol

__________________
Subscribe To ( jbexpress1) on YouTube...

Reply With Quote


  #5  
Old 09-08-2010, 11:15 AM
Banemorth's Avatar
Banemorth Banemorth is offline
Elite Member
 
Join Date: May 2010
Location: Sussex County, NJ
Posts: 1,599
Default

Awesome information. I'll wait until I have a big pile of unknown metal before testing since it's only good for 6 months.

__________________

E-Trac + Pro Pointer. 2011 Totals: 33 Silver Coins, 75 Wheats, Clad: $109.31 Gold: 1
My YouTube Channel http://www.youtube.com/user/TheBanemorth?feature=mhum
Reply With Quote


  #6  
Old 08-09-2013, 07:12 PM
budman" budman" is offline
New Member
 
Join Date: Aug 2013
Posts: 1
Default Platinum tests

why does my platinum acid turn green when i put my raw platinum nugget in the acid?
Reply With Quote


  #7  
Old 08-11-2013, 10:30 AM
OldCopper's Avatar
OldCopper OldCopper is offline
Full Member
 
Join Date: Feb 2013
Location: North Carolina
Posts: 198
Default

Great information - thanks!

__________________
GTI 2500, AT Pro, Lesche digger, Pistol Probe, Pro Pointer
Coin collector since the 1950s

Reply With Quote


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Questions about testing for gold using a stone and acid Ice Scratcher What's the Value? 3 06-30-2013 09:55 PM
Testing silver with 18k gold acid Video by ME! JBEXPRESS General Hobby Discussion 3 03-12-2013 03:05 PM
acid testing "gold"? 007tallguy Cleaning Your Finds 10 03-11-2013 09:23 AM
acid testing 22k gold? hoodleehoo Help To ID My Finds 0 01-30-2013 01:56 PM


All times are GMT -4. The time now is 02:00 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.