World of Coins

Collecting coins => Cleaning, conservation and storage => Topic started by: rajiv on September 13, 2016, 07:21:25 PM

Title: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on September 13, 2016, 07:21:25 PM
hello dheer sir , i also have this 1962 coin . but it is very dirty now , how to clean this old coin . have any tips as i dont know the metal too 
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: dheer on September 13, 2016, 08:07:08 PM
This is a pretty common coin. You can get a good grade easily.

You can try putting this in ketchup for 20 mins.
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: capnbirdseye on September 13, 2016, 09:06:57 PM
The coin has added interetst as it appears to be slightly double struck ?
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: Figleaf on September 13, 2016, 10:51:17 PM
I suspect your coin is nickel-brass, rather than bronze. Ketchup is highly acidic. It will eat into the metal. If you need to use acid, use diluted lemon or lime juice. Its acidity can be controlled and the coin remains visible.

However, acid may not be necessary. Try washing it vigorously is soapy water (it is OK to put it in a pocket of e.g. trousers, kept in place with a safety pin and wash it in a washing machine with the clothing. This should dissolve fatty substances and make the dirt softer. Dry well, preferably in sunshine. Use a wooden toothpick on stubborn dirt e.g. in or between letters and numbers. You can repeat this until either you are happy or washing is no longer effective. In the latter case, use a soft eraser to rub the coin. If you rub too long, the coin will get an unnatural, pale yellow shine. You can darken it by keeping it in olive oil for a few weeks. Rinse and dry well when you are happy. It should look yellow to dark yellow. Remember that cleaning will at best not increase wear, but if it is overdone, it may make your coin more worn.

Peter
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: Kopper Ken on September 14, 2016, 01:14:38 AM
Try leaving it in virgin olive oil for an extended period of time.  Definitely some doubling.  Worth a try.

KK :like:
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on September 14, 2016, 06:35:50 AM
thanks all for the advise . they say it is safe to put the coin in olive oil so i will follow the suit .
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on September 14, 2016, 06:38:54 AM
Try leaving it in virgin olive oil for an extended period of time.  Definitely some doubling.  Worth a try.

KK :like:
yes sir it seems to me a double strike coin and the mint is hyderabad too although i dont know how to detect the metal but i will put is in olive oil now for long long time .
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on September 14, 2016, 06:45:44 AM
The coin has added interetst as it appears to be slightly double struck ?
yes sir , although i was searching hyderabad mint coin out of my one paisa  coins pouch  and  found this coin out of 47 coins  and was unable to fine same type coin on ebay after that . will this be a common coin sir or a good coin to preserve .
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on September 14, 2016, 06:47:24 AM
I suspect your coin is nickel-brass, rather than bronze. Ketchup is highly acidic. It will eat into the metal. If you need to use acid, use diluted lemon or lime juice. Its acidity can be controlled and the coin remains visible.

However, acid may not be necessary. Try washing it vigorously is soapy water (it is OK to put it in a pocket of e.g. trousers, kept in place with a safety pin and wash it in a washing machine with the clothing. This should dissolve fatty substances and make the dirt softer. Dry well, preferably in sunshine. Use a wooden toothpick on stubborn dirt e.g. in or between letters and numbers. You can repeat this until either you are happy or washing is no longer effective. In the latter case, use a soft eraser to rub the coin. If you rub too long, the coin will get an unnatural, pale yellow shine. You can darken it by keeping it in olive oil for a few weeks. Rinse and dry well when you are happy. It should look yellow to dark yellow. Remember that cleaning will at best not increase wear, but if it is overdone, it may make your coin more worn.

Peter
hello figleaf sir , is there any method to detect the metal of this coin ? i mean at home if possible
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: Figleaf on September 14, 2016, 11:58:57 AM
Look at the colour. Bronze is brown, brass is yellow. Over-clean bronze and it becomes pinkish; over-clean brass and it becomes pale yellow. With a nice patina, bronze will be dark brown, brass dark yellow.

Peter
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: dheer on September 14, 2016, 01:56:59 PM
yes sir , although i was searching hyderabad mint coin out of my one paisa  coins pouch  and  found this coin out of 47 coins  and was unable to fine same type coin on ebay after that . will this be a common coin sir or a good coin to preserve .

It's a common coin. The doubling makes it special. However given the grade, it may not fetch much. Still its good to keep this in album.
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on September 14, 2016, 04:57:44 PM
Look at the colour. Bronze is brown, brass is yellow. Over-clean bronze and it becomes pinkish; over-clean brass and it becomes pale yellow. With a nice patina, bronze will be dark brown, brass dark yellow.

Peter
ok sir , i already put that coin in olive oil . now will wait for some months , then see the results . thanks .
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on September 14, 2016, 05:06:39 PM
It's a common coin. The doubling makes it special. However given the grade, it may not fetch much. Still its good to keep this in album.
hello dheer sir , i never sell coins . i only buy and collect . it is a UNC  coin but got bad  due to no proper storage and care
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on October 05, 2016, 02:32:23 PM
ok sir , i already put that coin in olive oil . now will wait for some months , then see the results . thanks .
few days dip in olive oil made my coin look better .
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on October 05, 2016, 02:34:57 PM
Look at the colour. Bronze is brown, brass is yellow. Over-clean bronze and it becomes pinkish; over-clean brass and it becomes pale yellow. With a nice patina, bronze will be dark brown, brass dark yellow.

Peter
yes sir , i guess it is a  brass coin but  bronze
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on July 21, 2017, 03:27:58 PM
yes sir , i guess it is a  brass coin but  bronze
after around 8 months of olive oil dip  result , the coin is clear now . olive oil worked great on my brass coin
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: dheer on July 21, 2017, 04:41:32 PM
Excellent. The double strike is much more visible.
Title: Discussion: Clean the1962 1 naya paise bronze coin
Post by: Bimat on July 21, 2017, 04:55:10 PM
Very impressive example of double struck coin. Congrats! :)

Aditya
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on July 25, 2017, 10:17:22 PM
Very impressive example of double struck coin. Congrats! :)

Aditya
thanks bimat sir  dheer sir and other senior members  ,  i  have learned a lot in past few months from this forum due to guidance from the seniors .
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on December 30, 2017, 09:25:17 PM
olive oil worked great for my bronze half pice too
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: Figleaf on December 31, 2017, 01:57:17 AM
Olive oil will solve dirt, so you were lucky that the black spot turned out to be dirt. You could have washed it in soapy water also. Soap solves fat and water solves dirt. In general, there is no cure for all coin ills, but water, soap and olive oil treatments do not attack metal, if the coin is neutralised (washed with clean water) and dried afterwards. If it doesn't help, it doesn't hurt either.

Peter
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: rajiv on December 31, 2017, 08:01:31 AM
Olive oil will solve dirt, so you were lucky that the black spot turned out to be dirt. You could have washed it in soapy water also. Soap solves fat and water solves dirt. In general, there is no cure for all coin ills, but water, soap and olive oil treatments do not attack metal, if the coin is neutralised (washed with clean water) and dried afterwards. If it doesn't help, it doesn't hurt either.

Peter
oh i see , i thought it was PVC green patina . one thing i want to  ask sir , when i take out the coin , only warm water shall be used to clean it further or little bit of    liquid soap shall also be added  before preserving it
Title: Re: Discussion: Clean the1962 1 naya paise bronze coin
Post by: Figleaf on December 31, 2017, 12:41:50 PM
PVC damage is easy to recognise by its bad smell (pecunia non olet disproved.) It spreads regularly over the whole coin, raised parts first. It is best removed with a chemical cleaner such as acetone.

Washing with soap does no harm if the coin is neutralised and dried afterwards. I neutralise coins with water only. I am no chemist. I am not aware of any long term effect of soap on metal, but why run the risk? Water will have a long term effect on metal, so the coin should be dried well after neutralising. If you want to conserve your coin after cleaning, Bruce61813, who is a real expert, recommends Renaissance wax (Renwax.)

Peter