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#1

LORD
Member
From: Roxby Downs, SA
Joined: 04 June 2016
Posts: 470
Member
24 October 2018 09:24 am

I have found the 50% silvers generally clean up better than the 925 ones.
Been experimenting with this 925 three pence and am struggling to get the black stains off completely. I have tried salt and vinegar, lemon juice, back to salt and vinegar, bi carb soda rub and even left it over nite in ali brite solution (scrubbing with a nylon brush all along)
I am happy to use this coin to experiment if anyone has other suggestions to try.
1540333353_20181024_083320.jpg1540333381_20181024_083351.jpg


GPZ 7000, Nox 800, Garrett Ace 300, Deteknix pin pointer, little ripper pick, pro gold pans
Oldest coin 1854 threepence, biggest nugget 2.4g

1 user likes this post: 7.62marksman

#2

Heatho
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From: Sydney, NSW
Joined: 29 April 2013
Posts: 12,832
Moderator
24 October 2018 09:45 am

Could try this one.

Soak in strong bi-card and water solution for 5 minutes and then wrap it tightly in aluminium foil.

Hold tight between your thumb and finger, coin will get warm, leave it like this for a few minutes and then rub with moist bi-carb again. Rinse and repeat if needed.

Do it outside as the coin will release rotten egg gas during the reaction.

Hope that helps.


Minelab GPX 5000, SDC2300, CTX3030, Equinox 800, patience, lot's of patience.

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#3

Smoky bandit
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Joined: 05 April 2016
Posts: 3,284
Member
24 October 2018 09:55 am

If soaking inlemon juice for a week or what Heatho said dosnt work try boiling the coin in water let cool so you can touch it then rub with bicarb paste between fingers..If that dont work a low voltage electrolysis will for sure thumbsup


No pain No gain..

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#4

Danny13
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Joined: 01 May 2016
Posts: 2,662
Member
24 October 2018 10:09 am

Could try a coin tumbler , but be careful when using the stainless steel media from China , as there are not really stainless steel cleaning media and turned a pandora pink metal colour. This is the result .1540336149_5a9a9c4a-9bcf-4c6e-b5a1-0de898c6f249.jpg
1540336149_40f549d4-a40b-4dce-a567-f6e95ca42d02.jpg


GPX5000, CTX3030, Sovereign GT garrett pointer, harness.

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#5

Smoky bandit
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Joined: 05 April 2016
Posts: 3,284
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24 October 2018 10:13 am

Danny13 wrote:

Could try a coin tumbler , but be careful when using the stainless steel media from China , as there are not really stainless steel cleaning media and turned a pandora pink metal colour. This is the result .https://www.prospectingaustralia.com.au/forum/img/member-images/7482/1540336149_5a9a9c4a-9bcf-4c6e-b5a1-0de898c6f249.jpg
https://www.prospectingaustralia.com.au … a42d02.jpg

Copper florins look good mate..will usually come off with a bicarb rub ...but I have never had them go that coppery....Looks nice mate thumbsup


No pain No gain..

#6

Danny13
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Joined: 01 May 2016
Posts: 2,662
Member
24 October 2018 10:20 am

Smoky bandit wrote:
Danny13 wrote:

Could try a coin tumbler , but be careful when using the stainless steel media from China , as there are not really stainless steel cleaning media and turned a pandora pink metal colour. This is the result .https://www.prospectingaustralia.com.au/forum/img/member-images/7482/1540336149_5a9a9c4a-9bcf-4c6e-b5a1-0de898c6f249.jpg
https://www.prospectingaustralia.com.au … a42d02.jpg

Copper florins look good mate..will usually come off with a bicarb rub ...but I have never had them go that coppery....Looks nice mate thumbsup

Should Get a premium for them playful


GPX5000, CTX3030, Sovereign GT garrett pointer, harness.

1 user likes this post: Smoky bandit

#7

Danny13
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Joined: 01 May 2016
Posts: 2,662
Member
24 October 2018 10:23 am

Danny13 wrote:
Smoky bandit wrote:
Danny13 wrote:

Could try a coin tumbler , but be careful when using the stainless steel media from China , as there are not really stainless steel cleaning media and turned a pandora pink metal colour. This is the result .https://www.prospectingaustralia.com.au/forum/img/member-images/7482/1540336149_5a9a9c4a-9bcf-4c6e-b5a1-0de898c6f249.jpg
https://www.prospectingaustralia.com.au … a42d02.jpg

Copper florins look good mate..will usually come off with a bicarb rub ...but I have never had them go that coppery....Looks nice mate thumbsup

Should Get a premium for them playful

Ive got some porcelin cleaning beads from the gem shop - should do the trick


GPX5000, CTX3030, Sovereign GT garrett pointer, harness.

1 user likes this post: Smoky bandit

#8

Smoky bandit
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Joined: 05 April 2016
Posts: 3,284
Member
24 October 2018 10:31 am

Danny13 wrote:
Danny13 wrote:
Smoky bandit wrote:
Danny13 wrote:

Could try a coin tumbler , but be careful when using the stainless steel media from China , as there are not really stainless steel cleaning media and turned a pandora pink metal colour. This is the result .https://www.prospectingaustralia.com.au/forum/img/member-images/7482/1540336149_5a9a9c4a-9bcf-4c6e-b5a1-0de898c6f249.jpg
https://www.prospectingaustralia.com.au … a42d02.jpg

Copper florins look good mate..will usually come off with a bicarb rub ...but I have never had them go that coppery....Looks nice mate thumbsup

Should Get a premium for them playful

Ive got some porcelin cleaning beads from the gem shop - should do the trick

Let me know how they go mate..was thinking of getting some of that porcelin beads as most of my sea silvers are really crusty and black underneath that crust.


No pain No gain..

#9

Danny13
Member
Joined: 01 May 2016
Posts: 2,662
Member
24 October 2018 10:38 am

Smoky bandit wrote:
Danny13 wrote:
Danny13 wrote:
Smoky bandit wrote:
Danny13 wrote:

Could try a coin tumbler , but be careful when using the stainless steel media from China , as there are not really stainless steel cleaning media and turned a pandora pink metal colour. This is the result .https://www.prospectingaustralia.com.au/forum/img/member-images/7482/1540336149_5a9a9c4a-9bcf-4c6e-b5a1-0de898c6f249.jpg
https://www.prospectingaustralia.com.au … a42d02.jpg

Copper florins look good mate..will usually come off with a bicarb rub ...but I have never had them go that coppery....Looks nice mate thumbsup

Should Get a premium for them playful

Ive got some porcelin cleaning beads from the gem shop - should do the trick

Let me know how they go mate..was thinking of getting some of that porcelin beads as most of my sea silvers are really crusty and black underneath that crust.

Try a cap full of clr in the mix - really crusty run for a couple of hours should come out gleaming.


GPX5000, CTX3030, Sovereign GT garrett pointer, harness.

#10

Smoky bandit
Member
Joined: 05 April 2016
Posts: 3,284
Member
24 October 2018 10:44 am

Danny13 wrote:
Smoky bandit wrote:
Danny13 wrote:
Danny13 wrote:
Smoky bandit wrote:

Copper florins look good mate..will usually come off with a bicarb rub ...but I have never had them go that coppery....Looks nice mate thumbsup

Should Get a premium for them playful

Ive got some porcelin cleaning beads from the gem shop - should do the trick

Let me know how they go mate..was thinking of getting some of that porcelin beads as most of my sea silvers are really crusty and black underneath that crust.

Try a cap full of clr in the mix - really crusty run for a couple of hours should come out gleaming.

Was worried about the chemicals reacting with the perspex....Aslo was thinking the porcilin beads might chew through it over time as well.Some cleaning powders also build up preasure and it leaks everywhere.


No pain No gain..

#11

Danny13
Member
Joined: 01 May 2016
Posts: 2,662
Member
24 October 2018 11:01 am

Smoky bandit wrote:
Danny13 wrote:
Smoky bandit wrote:
Danny13 wrote:
Danny13 wrote:

Should Get a premium for them playful

Ive got some porcelin cleaning beads from the gem shop - should do the trick

Let me know how they go mate..was thinking of getting some of that porcelin beads as most of my sea silvers are really crusty and black underneath that crust.

Try a cap full of clr in the mix - really crusty run for a couple of hours should come out gleaming.

Was worried about the chemicals reacting with the perspex....Aslo was thinking the porcilin beads might chew through it over time as well.Some cleaning powders also build up preasure and it leaks everywhere.

Yeah i found that the first time with the leaking , but the seal came good. Put in some detergent , acts as a sulfactant and should sort out any pressure build up fill a quarter of the tumbler with water . The only issue I have had is with the pink stainless steel media . If you were using clr over a 24 hour period , would not recommend it . Afterwards i make sure any clr is cleaned from the media also . I only use clr on the really black and crusty coins.


GPX5000, CTX3030, Sovereign GT garrett pointer, harness.

1 user likes this post: Smoky bandit

#12

Goldpick
Moderator
From: Mount Gambier
Joined: 07 November 2013
Posts: 7,869
Moderator
24 October 2018 11:33 am

I just use cheapo aquarium gravel as tumbling media, you can buy bags of it from shops like cheap as chips - still an abrasive method, so be careful on which coins you chose to tumble. Have tried the foil method and found it sometimes has funny reactions with .925 coins, leaving a rough texture on the coin surface.

Electrolysis is the quickest and easiest method to clean the black oxidation, just have to ensure that your anodes are the correct way around, regularly replace the saline solution, and don't use stainless steel for anode sitting in the solution (toxic). You don't have to give it long using electrolysis, just enough to loosen the black oxidation and the final cleanup can be done with a light bicarb rub. 50% silver coins will not like Electrolysis, as the copper content will likely come out of the solution and re-coat the coin causing the "pink" copper colouring. If unsure, try it out on a few crappy coins first before diving in head first with any good quality examples.

I like to keep some rarer .925 coins as is, sometimes I prefer to see it in its original condition - adds to the nostalgia of the coin.


Prospecting gear: Used - Whites GM3, GM2, GMT, ML XT17000, ML X-Terra 305, Garrett Gold Stinger, Tesoro Vaquero, Nokta RS pinpointer, Minelab Explorer SE Pro/Etrac, Ace 250
Current - XP Deus, Makro Racer 2, Fisher F75, Tesoro Tejon, Teknetics G2, Whites SPP, Garrett Infinium, Minelab Go-Find 60, XP MI-6, Minelab Profind, Whites Bullseye TRX, Deteknix X-pointer, Garrett AT Pointer

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#13

LORD
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From: Roxby Downs, SA
Joined: 04 June 2016
Posts: 470
Member
24 October 2018 12:19 pm

Great feedback all, thanks.
Here it is after 2 goes of Heatho's bi carb soak and then aluminum foil
It has definatley lifted some of the black, I will try SB's boiling water and then bi carb and post results.
Electrolysis will be a last resort as I have has poor results with that in the past
1540343973_20181024_114433.jpg


GPZ 7000, Nox 800, Garrett Ace 300, Deteknix pin pointer, little ripper pick, pro gold pans
Oldest coin 1854 threepence, biggest nugget 2.4g

4 users like this post: Smoky bandit, Danny13, Heatho, 7.62marksman

#14

LORD
Member
From: Roxby Downs, SA
Joined: 04 June 2016
Posts: 470
Member
24 October 2018 01:13 pm

The trippy has had 2 dunks in boiling water and then bi carb rub, each time it was in the boiling water approx 5 mins and I was able to rub almost immediately after removing.
It has made a small difference but believe the bi carb soak and rub did a bit better.
Currently in another bi carb soak
1540347160_20181024_123830.jpg


GPZ 7000, Nox 800, Garrett Ace 300, Deteknix pin pointer, little ripper pick, pro gold pans
Oldest coin 1854 threepence, biggest nugget 2.4g

4 users like this post: Smoky bandit, Heatho, Danny13, 7.62marksman

#15

SinHof
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Joined: 19 July 2013
Posts: 881
Member
24 October 2018 04:40 pm

Hi Lord,
Try soaking it in a fairly stiff solution of citric acid and water for five or ten seconds and then wrap it tightly in aluminum foil as per Heatho's directions, after that, a rub down with bi-carb; worked quit well for me on silvers.
Cheers, SinHof.

1 user likes this post: LORD

#16

Trash
Member
From: 3030, VIC
Joined: 26 January 2018
Posts: 585
Member
24 October 2018 06:08 pm

Smoky bandit wrote:

If soaking inlemon juice for a week or what Heatho said dosnt work try boiling the coin in water let cool so you can touch it then rub with bicarb paste between fingers..If that dont work a low voltage electrolysis will for sure thumbsup

Yep

Electrolysis for the black stuff ...!!


Gpx 5000 ( sold ) Sov. GT ( Sold ) Ctx 3030 still have , 7000

#17

LORD
Member
From: Roxby Downs, SA
Joined: 04 June 2016
Posts: 470
Member
24 October 2018 08:37 pm

The thrips has been spending most of the day in strong bi carb soda mix occasionally taking it out to wrap in alfoil as suggested.
I have done this 4 more times, so 6 in total. Leaving I the bi carb mix for up to hours at a time.
I must admit I never felt the alfoil get hit or smell the rotten egg gas so hopefully I done it correct.
It has definatly improved a lot, the key is patience and repetitive.
I am going to try the strong CAB and alfoil method now and see if it improves

1540373538_20181024_200107.jpg


GPZ 7000, Nox 800, Garrett Ace 300, Deteknix pin pointer, little ripper pick, pro gold pans
Oldest coin 1854 threepence, biggest nugget 2.4g

2 users like this post: 7.62marksman, goody2shoes

#18

LORD
Member
From: Roxby Downs, SA
Joined: 04 June 2016
Posts: 470
Member
24 October 2018 10:14 pm

The silver is now fully cleaned.
SinHof, your suggestion seemed to work really well.
Soak in a strong CAB solution, then wrap tightly in alfoil and finish with a bi carb rub.
I done this 2 times to get the final result.
Could smell the rotten eggs this time so I know it was working, I could also see an imprint off the black stain on the alfoil once removed

Didn't seem to affect the obverse at all so guessing the reverse was always going to turn out like this.
Happy with the results.
1540379658_20181024_213718.jpg1540379683_20181024_213742.jpg


GPZ 7000, Nox 800, Garrett Ace 300, Deteknix pin pointer, little ripper pick, pro gold pans
Oldest coin 1854 threepence, biggest nugget 2.4g

5 users like this post: 7.62marksman, Eldorado, Sandta, Greenhornet_au, goody2shoes

#19

LORD
Member
From: Roxby Downs, SA
Joined: 04 June 2016
Posts: 470
Member
25 October 2018 03:04 pm

After the success off the three pence I got out a stubborn florin that I have tried cleaning without success.
The strong CAB soak followed by aluminum foil wrap and bi carb rub worked a treat again. I did this 4 times and found longer in the CAB, less in the foil worked well.
It now looks much better for displaying in my opinion.

Before1540440134_20181025_142714.jpg1540440164_20181025_142741.jpg

AFTER thumbsup thumbsup thumbsup thumbsup thumbsup thumbsup
1540440222_20181025_142626.jpg1540440249_20181025_142647.jpg


GPZ 7000, Nox 800, Garrett Ace 300, Deteknix pin pointer, little ripper pick, pro gold pans
Oldest coin 1854 threepence, biggest nugget 2.4g

5 users like this post: goody2shoes, Smoky bandit, Dave79, Sandta, Eldorado

#20

Goldpick
Moderator
From: Mount Gambier
Joined: 07 November 2013
Posts: 7,869
Moderator
25 October 2018 08:45 pm

See what I mean about the rough surface that the foil method sometimes results in. It did get rid of the oxidation, though there's something going on with the reaction between the aluminium and silver that coats what would have been quite a smooth surface. Anyway, if you are happy with the results, then that is all that matters. big_smile


Prospecting gear: Used - Whites GM3, GM2, GMT, ML XT17000, ML X-Terra 305, Garrett Gold Stinger, Tesoro Vaquero, Nokta RS pinpointer, Minelab Explorer SE Pro/Etrac, Ace 250
Current - XP Deus, Makro Racer 2, Fisher F75, Tesoro Tejon, Teknetics G2, Whites SPP, Garrett Infinium, Minelab Go-Find 60, XP MI-6, Minelab Profind, Whites Bullseye TRX, Deteknix X-pointer, Garrett AT Pointer


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